I don’t see anything specific on the internet explaining this, however the way it worked on Version 1 (2021) was the Pro had a bigger and name brand battery 24.5 A/hr, and Hydraulic brakes. Both IMO are important and for the $300 extra at that time, a smart purchase.
The V2 ads a built in headlight which it really needed, also a claimed splash protection / water resistance (“With a new lighting package, full hydraulic brakes, and IPx5 waterproofing,”) but i would be wary of this as no manufacturer will warranty water damage.
From what I see on the Fluid free Website is the “V2” has the 18.5 A/hr battery. but it does have the hydraulic breaks, the Pro mentions the bigger battery and a black color scheme on an Australian website…
Overall this is a great scooter except the stem latching clamp. Very quick, very easy to maneuver, super long range (24.5 battery) if you don’t punch it constantly in 2 wheel turbo mode, mine has be very reliable from day one.