I always thought these were dodgy rhymes, but yes the first is assonance and the second one just tongue in cheek:

I’m thinking and a wondering all way down the road
I once loved a woman, a child I am told

It’s too late for turning in your light, Babe
The light I never knowed
It’s too late for turning on your light, Babe,
I’m on the dark side of the road.

As for Willie McBride, I thought that was actually a genuine name from a war grave, albeit a great one for rhyming possibilities.