Charlie Horner interviewed Sammy at length. I also asked him (Sammy), about this 45 and he says it's the same group but details were sketchy. Like Bob A, I know Charlie and if he's leaning towards it being the same group I'd tend to trust his judgement, they don't come much more thorough that Pam and Charlie Horner.
Thing is...artists are sometimes just as 'in the dark' as we are when it comes to actual 45s. I've shown records to artists, producers, musicians and they've 'claimed them' but I've known that it isn't them and by the same token sometimes they've never heard of something with their name on it. It happened only a few weeks ago with a well known Philly writer/producer who categorically stated that he hadn't written and produced a song with is name on it. His answer was "Oh, that will be ^%#((*'s doing. He did that a lot to help me out".
At Prestatyn a few years ago, some people took as Gospel Sammy's comment that Demos of Job Opening were never actually pressed. Despite him having seen both Greg T's and mine a few years earlier and him donating a scan of it to Charlie's piece. It's a funny old game eh?
Regards,
Dave