What's difference between - Speed Passion GT V2.1 ESC Pro Stock & V2.1 EX Version

[carlin]

Hi Guys,

I'm bit confused whats the difference between these two Speedo's

Speed Passion GT V2.1 EX Brushless ESC vs Speed Passion GT V2.1 Brushless ESC Pro Stock Edition

It's to run with my FS2 4wd on a 6.5t SP V3 motor.

The EX says ok for 2wd but doesn't mention what about 4wd it's more about running onroad 1/12th & 1/10th stock.

Any advice would be great, which model does Lee Martin run on his?

Thanks