Quick response is Bronson F ,yes, is all 'Robin-A-Thrush' Roud 2792. And other than refrains I can't see any textual similarity here. The 2 songs in text are easily separable. If it was me I'd just give one full version of R-A-T in an appendix and leave it at that. Apart from a little crossover they are 2 separate songs.

More anon.