The Browns' version is indeed similar to Dunstan's song "The Plough-Boy." I've not heard it so I don't know their tune. The one Dunstan gives, unlike the one in DT (from Palmer - not quite identical to the one Baring-Gould gives in Songs of the West) is completely in 3/4 time. Dunstan says: This is a "restoration" from the Warleggan Song (Old Cornwall, No. 8, p.38) by Mr. R. Morton Nance, June 12 1929. The tune is adapted from an old English melody, and embodies part of the Ox-Driver's Song).

This latter is a fragment, again in 3/4. The text runs: "Neat" and "Comely," "Spark" and "Beauty," "Gowdlock," "Speedwell!" For we are the lads that do follow the plough.

The major textual difference is that Dunstan has an extra verse (given as verse 2):

In the heat of the day no work is to do;
Our plough clapped aside for an hour or two,
On banks of sweet wild-thyme we then take our rest,
Where sunshine is tempered with winds from the west.