Yes, you can use the neoAir v1 and neoAir v2 on the same system.
There are some differences between the two models, the differences are detailed below.
Dimensions - The neoAir v1 is 86x86x26mm The neoAir v2 is 90x90x23mm (L,H,D)
Holiday - The neoAir v2 has a calendar, so a return time and date can be set. On the neoAir v1, only a number of days can be entered.
Back Light The neoAir v1 back light is blue, the neoAir v2 is white
Illuminated Keys - The neoAir v2 has illuminated keys, the neoAir v1 does not
Simplified Menu - We have simplified the navigation menu on the neoAir v2.