I’m just curious, do movie makers change the previews depending on the showtime?
I’m a little confused by your question, but if you’re asking if the movie theaters have different trailers for each showing of one movie, the answer is no, it would be too tedious to go in there and splice new trailers on every showtime. However, in the event that a theater has two or more prints of one movie, chances are each print will have different trailers on each one.