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Q Pro vs. Q:
Added bluetooth
Added 4000mah battery
Default PC plate
Double shot KSA keycaps
New color theme with white as one of the default three
Offered with K Pro Banana switches (tactile) instead of blues

Q Max vs Q Pro:
Added 2.4ghz
More foam

V Max vs V
Added Bluetooth and 2.4ghz
Case foam instead of silicone pad and one additional PET foam layer
Added 4000 mAh battery
Default PC plate
Gasket mount instead of tray mount
More MCU storage (256kb vs 128kb)
Gateron Jupiter switches instead of Keychron K Pros, blues got replaced for bananas

K Max vs K Pro (low profile):
Added 2.4ghz
Added PCB switch pads and latex foam