Jamie McMenemy sings with a scottish accent and in Scots which I cannot follow well without having a comparison text. Vour reference is for two versions that don't match
I think theirs is a version B and C rewrite

'Child Noryce'- Version B; Child 83 Child Maurice
Motherwell's Manuscript, p. 255; Motherwell's Minstrelsy, p. 282.
1    Child Noryce is a clever young man,
He wavers wi the wind;
His horse was silver-shod before,
With the beaten gold behind.

2    He called to his little man John,
Saying, You don't see what I see;
For O yonder I see the very first woman
That ever loved me.

3    'Here is a glove, a glove,' he said,
'Lined with the silver grey;
You may tell her to come to the merry greenwood,
To speak to Child Nory.

4    'Here is a ring, a ring,' he says,
'It's all gold but the stane;
You may tell her to come to the merry greenwood,
And ask the leave o nane.'

5    'So well do I love your errand, my master,
But far better do I love my life;
O would ye have me go to Lord Barnard's castle,
To betray away his wife?'

6    'O don't I give you meat,' he says,
'And don't I pay you fee?
How dare you stop my errand?' he says;
'My orders you must obey.'

7    O when he came to Lord Bernard's castle,
He tinkled at the ring;
Who was as ready as Lord Barnard himself
To let this little boy in?

8    'Here is a glove, a glove,' he says,
'Lined with the silver grey;
You are bidden to come to the merry greenwood,
To speak to Child Nory.

9    'Here is a ring, a ring,' he says,
'It's all gold but the stane;
You are bidden to come to the merry greenwood,
And ask the leave o nane.'

10    Lord Barnard he was standing by,
And an angry man was he:
'O little did I think there was a lord in the world
My lady loved but me!'

11    O he dressed himself in the holland smock,
And garments that was gay,
And he is away to the merry green-wood,
To speak to Child Nory.

12    Child Noryce sits on yonder tree,
He whistles and he sings:
'O wae be to me,' says Child Noryce,
'Yonder my mother comes!'

13    Child Noryce he came off the tree,
His mother to take off the horse:
'Och alace, alace,' says Child Noryce,
'My mother was neer so gross!'

14    Lord Barnard he had a little small sword,
That hung low down by his knee;
He cut the head off Child Noryce,
And put the body on a tree.

15    And when he came home to his castell,
And to his ladie's hall,
He threw the head into her lap,
Saying, Lady, there's a ball!

16    She turned up the bloody head,
She kissed it frae cheek to chin:
'Far better do I love this bloody head
Than all my royal kin.

17    'When I was in my father's castel,
In my virginity,
There came a lord into the North,
Gat Child Noryce with me.'

18    'O wae be to thee, Lady Margaret,' he sayd,
'And an ill death may you die;
For if you had told me he was your son,
He had neer been slain by me.'

'Bob Norice'- Version C; Child 83 Child Maurice
Motherwell's Manuscript, p. 510
1    Bob Norice is to the grein-wud gane,
He is awa wi the wind;
His horse is siller-shod afore,
In the shynand gowd ahind.

2    He said unto his wee boy John,
I sie what ye dinna sie;
I see the [first] woman that I eer luvit,
Or ever luvit me.

3    'Gae tak to hir this pair o gluvis,
They're o the siller-gray,
And tell her to cum to the merrie grein-wud
An speik to Bob Norice.

4    'Gae tak to her this gay gowd ring,
And it's aw gowd but the stane,
And tell her to cum to the merrie grein-wud,
And ask the leive o nane.

5    'Gae tak to her this braw manteil,
It's a' silk but the sleive,
And tell her to cum to the merrie green-wud,
And ax nae bauld Barnet's leive.'

6    'I daurna gang to Lord Barnet's castel,
I daurna gang for my lyfe;
I daurna gang to Lord Barnet's castell,
To twyne him o his wife.'

7    'Do I nae pay you gowd?' he said,
'Do I nae pay you fee?
How daur you stand my bidding, Sir,
Whan I bid you to flee?'

8    'Gif I maun gang to Lord Barnet's castel,
Sae sair agane my will,
I vow a vow, and I do protest,
It sall be dune for ill.'

9    But whan he came to Lord Barnet's castel
He tinklet at the ring;
Tha war nane sae ready as Lord Barnet himsell
To let the wee calland in.

10    'What news, what news, my bonnie wee boy?
What news hae ye to me?'
'Nae news, nae news, Lord Barnet,' he said,
'But you ladie I fain would see.

11    'Here is a pair o gluves to her,
Thay'r o the silver gray;
And tell her to cum to the merrie green-wud,
And speik to Bob Norice.

12    'Here is a gay gowd ring to her,
It's aw gowd but the stane;
And she maun cum to the merrie green-wud,
And speir the leive o nane.

13    'Here is a gay manteil to her,
It's aw silk but the sleive;
And she maun cum to the merrie grein-wud,
And ask not bauld Barnet's leive.'

14    Then out bespack the yellow nurse,
Wi the babie on her knee,
Sayand, Gif thay be cum frae Bob Norice,
They are welcum to me.

15    'O haud your tung, ye yellow nurse,
Aloud an I heir ye lie;
For they're to Lord Barnet's lady,
I trew that this be she.'

16    Lord Barnet's to a dressing-room,
And buskt him in woman's array,
And he's awa to the merrie green-wud,
To speik to Bob Norrice.

17    Bob Norrice he sits on a tree,
He is whissland and singand;
Says, Merrie, merrie may my hert be,
I see my mither cumand.

18    Bob Norice he cam doun frae the trie,
To help his mother to licht fra her horss;
'Och alace, alace,' says Bob Norice,
'My mither was neer sae gross!'

19    Lord Barnet had a not-brown sword,
That hung down by his knee,
And he has cut Bob Norice heid
Aff frae his fair bodie.

20    He tuke the bluidy head in his hand,
And he brocht it to the ha,
And flang it into his lady's lap,
Sayand, Lady, there is a ba!

21    She took the bluidy heid in her hand,
And kisst it frae cheik to chin,
Sayand, Better I lyke that weil faurit face
Nor aw my royal kin.

22    'Whan I was in my father's bour,
A' in my dignity,
An Englis lord a visit came,
Gat Bob Norice wi me.'

23    Then out bespak Lord Barnet syne,
And a wae, wae man was he,
Sayand, Gif I had kent he was your son,
He wuld neer been killit be me.

But it's too hard a task for me!!