Oh, giving the film a new name alters how it is made, I doubt it. So to say the original has a better bitrate than what the Americans bought it as, seems a bit odd.
As often happens a new distributor puts the copyright in their name, often under Artwork, it alters the credits to suit todays requirements ( the original credits might state the firm that did the puppetry modelling but the modern versions will list every person employed at that firm. I don't know if it has anything to do with the US claims but the running time for the original version is 91 minutes and the re-edited (cut) American version is 78 minutes.
Now have a look at a Quatermass and the Pit when in US it got the name, ' 5,000,000 Miles To Earth ' so the American's lost the 'cult ' following.
But the idiots tried to sell a DVD of the first series even though the last four episodes of the first series were not recorded.
PS And here is where you can laugh if you want to. The creature from the Black Lagoon, does it have the name Donald Trump?