I think it is generally true to say that individual genes don't work in a vacuum, and neither do the biological mechanisms they encode for, so the transferred D

I think it is generally true to say that individual genes don't work in a vacuum, and neither do the biological mechanisms they encode for, so the transferred DNA would have to contain a suite of co-dependent genes. Admittedly, there is a counter-example in the transfer of genes conferring resistance to a particular pathogen. I think it is also true to say that convergent evolution often produces results that differ genetically, even though the resulting phenotypes serve the same purpose.