I don't see that as changing the story, just presenting it incompletely.
And thus you can assume that that everything which happens in the complete full length episodes also happens in the edited and shortened episodes for syndication.
But I suppose there are fans who would say that something which is not seen and heard in the shortened edits never really happened in those edits. And I am not certain if there is a way to totally disprove such an attitude.
I personally tend to imagine that anything which happens in any edit of any production happens in all edits of that production.