Aural evidence would suggest otherwise - a close listen to the LP and to his USA 45 and then a listen to the later "To Win You Love " 45 and to my ears it is absolutely plain as day that they are one and the same person/vocalist.
And they are all Chicago label recordings , even if some of his 6Ts tracks may have been recorded in Detroit.
As we soul fans have found from time to time, in later life some of our soul heroes have either simply forgotten about their earlier recordings (although I believe the Talkin Bout Jones 45 was a regional break out around Chicago - perhaps our friend Bob(a) might expand on that ) .
In Bobby's case though , as he was still trying to make it in the business in the early 80's , he may in Mike Ward's interview have deliberately disowned his earlier recordings as he may have been trying to establish a new persona as Bobby Jonz and not run the risk of somebody dredging up what might - in his eyes at least - have been raw inferior records from the distant past that never really gave him a big hit or made him a star.