Here are the two assembly guides that show the step by step installation process for each.You’ll likely end up with sort of a hybrid of the Mini 1.04 depending on your connector pinout, but you aren’t adding any new pins so everything should still line up.
2.1 toolhead assembly
you will need:
Beefy Extruder Idler
Beefy idler latch
extruder mount 2.11
heatsink fan mount
Extruder fan mount (it looks the same, but i can’t tell if its the same angle on the back. )
you will also need to source the new fan (preferably with pins pre-crimped) a handful of M3 Heat set inserts (mcmaster carr has them in bulk, or you can get from lulzbot or itworks3d.com I believe) The only tricky part of the whole process is extracting the old fan pins. Make sure you have a very small pointed object to get teh pins out eithout breaking the connection block. I tend to use an xacto knife for that, but you have to be careful not to cut something important.
I would rate the swap out as “moderate " difficulty. if you can use a soldering iron to insert heat set inserts and if you can crimp a pin, you will have no problems. When you go to do the swap, leave a 4” long section of fillament in the hotend. You can then use that to re-allign everything when you are finished.