The rear pads are completely different. They have springs built in that hold them in place. As somebody else mentioned, the rear pistons can NOT just be pushed in! They MUST be twisted in, if you use a c-clamp on them, you can break the ratcheting mechanism inside!
Deglazing the rotors, even if they are smooth, is a good idea. You dont need to necessarily turn them to accomplish this (there are even at-home kits one can use).
I would perform some function to remove glaze, at a minimum.
We turn rotors anytime we replace brake pads. The rotor may look smooth, but it is worn according to the old pads, not turning them can speed up the wear process on the new ones.