Thanks for your replies.
Thanks for your supporting evidence, setlist scotty (I did mean the data ring codes, and then the plastic region, inside of that, for the mould SID code- an IFPI number, alike the one found on the data ring)!
Out of interest, I have, also, checked a few other volumea, I had acquired a while back- Made In Japan, and The Falling Into Infinity demos; I have a few others, as well, but they are boxed away, currently- and they don't correspond, either.
I had considered both points you raised, rumborak- I alluded to the first of them, in my OP, of course- and I guess that I wouldn't, ultimately, be all that bothered, if they are counterfeit- but otherwise excellent replications- (assuming pertinents match, e.g. sound quality).
However, these are fitting into a bit of a project I'm currently, open-endedly set upon, in trying to deduce how, and to what level of difference, counterfeit replications are being made.
I've encountered quite a few other suspected-actual counterfeit versions of releases recently- new orders, and older purchases checked back upon, with recently discoveted info (essentially that re mould SID codes)- but ultimately how counteractive I'll be, in resultant practice, will certainly factor in effort vs discrepancy in place, against price, paid etc, so I'm sure thete would ocasions where I'd (consciously) accept it, yeah.
P.s// more replies are welcome.