Be honest I dont know why, but there are lots of cases where somebody connected with the label or song goes off and releases another 45 of a song, think 'the Phantom - Come back to me' on Karisma, and Sonny Craver on Musette, think we discussed this recently and its highly likely a different singer, also Melvin Davis on Groovesville and John L Brown - I'm Losing You is another discussed on here..
I dont think the Mr Soul is a fake, its one of those 45's that came out twice, very likely due to somebody either believing in the song, and putting it out again, Or maybe as allot of times with record labels in the 6ts there was some sort of dispute, and another 45 was released, strange it's on the same label, my examples above aren't, but we dont know.
Its a puzzle for sure..
Malcolm