between ZTL1 vs ZTL2, are there any nuances that I need be aware of when taking off the caliper?
NO
Any differences in the master cylinder?
NO
How involved should my cleaning of the calipers be? (i've only worked on fixed calipers on cars, never floating and on motorcycles)
the calipers do not "float". the rotors slightly do. clean as you would an automotive caliper. clean outside extremely well and around the piston dust seals. squeeze each piston fully into its bore to expel all fluid and break any rust/corrosion loose inside the bore. leave it go at that.
14mm MC rebuild kit works? Should I look for an SAE version,
NO and YES
here ya go. use OEM kit. or order from any dealer. i provided you with the part #.
https://www.ebay.com/p/99-10-Genuine...6276489&chn=ps