Don’t assume you know what anyone thinks or wants.
Your assumptions are based on your previous experience with people, while they might have changed their opinion, learned something new, or figured out a better approach.
Assuming that things are exactly the same as the last time you worked together could lead you down the path of frustration, as others will be annoyed (or worse) by the fact that you assumed they are still in the old place, doing what they used to be doing.
Much better to ask and clear up everything beforehand.
(A simple “Should we take the same approach as the last time?” question can work wonders.)