It'll wash cleaner than your analogy that 70's soul is more akin to the classic 60's soul though. I just can't see it, sorry, and the litmus test is that IF it did relate to 60's soul, then I would immediately open my ears to it and like it wouldn't I, which is what automatically happens when I hear a 60's sounding record. When I hear a 70's sounding record, I just shut down because the elements that make great 60's soul music have been replaced by something else.
One of your examples, the O'Jays "Love Train" has absolutely nothing in common with 60's styles whatsoever, nothing - apart from the vocalists.
n.b. this is in fact akin to you telling me that because I like 60's rocksteady that I should enjoy 70's roots reggae, but I detest 70's roots reggae because - and here we go again - it sounds nothing like the 60's music!