We've discussed this point a couple of times before. There's only one 1/96 Revell Constitution kit. It dates from the mid-sixties, and has been reissued more times than I care to count - on both sides of the Atlantic. But the boxes contain identical kits.
How the two branches of Revell came up with those different parts counts I have no idea. Maybe they counted things like the "sails" and "ratlines" differently. Or maybe the spools of thread.
The bottom line is that, especially considering its age, it's a fine kit. This forum contains several threads by modelers who've produced outstanding models from it. Good luck!
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.