I think there is, at least in my experience.
I always struggle to find a good tactic at the beginning of each FM, but when I find the right one, I never change it, at most I change a few instructions or the mentality depending on the opponent.
Maybe what you say happen with some tactics...
https://www.dropbox.com/sh/vbxxpihzteraf53/AABsPoJ9tN7IEOweRUPAkj5na/Schedules/FM21 New Schedules?dl=0&subfolder_nav_tracking=1
I use most of the season the "complete" one. When I have 2 matches I try to use tactical/set pieces trainings. I also do this and it works to me:
(Put double intensity...
I continued my save with Fulham in the Premier League. With the IWBs I didnt start badly, but it was difficult to score and in the end I only had numbers to finish mid-table (which isn't too bad). At mid-season I switched to Ruhral (WBS variant) tactic and finished 4th. Last year I tried that...