Tickets and fastpasses

I am working on TPs and with the new updated CLs I am thinking of switching my rest day and 1 of my MK days… When a package is booked are the tickets linked with a specific day? Meaning if my TA and I originally decided a Tuesday was my rest day and Monday my MK day and I want to switch do I need to have her alter my plans in MDE? My fastpasses day is next week so I’m finalizing plans

You can decide when to use your tickets during your stay. You can book FPs for the amount of days in your tickets. You can change your mind on what park you visit. If you have already booked FPs go in to modify the day you no longer want.