the actual first 'movie' is only 21 minutes long, about the same as a regular episode, and serves more as a prequel to the series as whole than anything else. So the English 'Digimon: The Movie' is mostly just two movies stuck together with an extra bit at the beginning, I guess?

I remember the English version being... inconsistent in a lot of ways. Fun at the time, since I didn't know any better, but looking back i can't imagine wanting to rewatch the og dubbed version. Soundtrack was good, at least.