I'm 99.999% sure they're the same kit. Revell Germany is notorious for botching up things like scale measurements and dimensions in its advertising and boxtop copy. I have no idea where the discrepancy in the parts count comes from, but I suspect it's either an outright mistake or the result of somebody counting components that somebody else didn't. (Did they count the spools of thread? The individual "ratline" assemblies? The crew figures? The piece of clear plastic for the transom and quarter gallery windows?)
I haven't actually looked at either kit for a good many years, but several members of this Forum have commented that Revell Germany's quality control leaves a great deal to be desired. There are lots of complaints of warped parts, broken parts, etc., etc. I don't know whether the American-produced ones are categorically better or not.
Bottom line: it's a fine old kit - an extremely sound basis for a good scale model. But it's also an old kit (42 years old, to be exact), and it shows it. In its defense, when I was 42 years old I looked considerably worse.
Youth, talent, hard work, and enthusiasm are no match for old age and treachery.