Assuming that you have a 74* seat tube angle.
If you move the saddle up 5mm the saddle moves back 1.4mm
If you have a 75* seat tube angle and make the same 5mm change the saddle moves back 1.3mm.
Let’s also assume you’re using something like KoPS to set your fore-aft.
The crank is 5mm shorter so your knee is 5mm in front of where it should be if everything stays the same. But then you move your saddle up and back. So it’s like 3.6mm in front of where it should be.
Again, if you want to use KoPS (or Nerfherder or Chimpanzeeeees or Australian dollars, whatever, it doesn’t matter) you’d want to move your saddle back 3.6mm to compensate for everything.
BIG BUT:
The goal is to have a different position and different results. So pretty much, all bets are off until you spend time in the saddle, let your body/muscles get used to things and then start to test (efficiency, aero, power, vegemite, whatever.).
What I wouldn’t do, is move anything more than 5mm at a time. In another thread I mentioned that doing more than can lead to problems. In my case it was a damaged sartorius, a lot of PT and lots of time off the bike.