The Rally was a bit more Off Road biased and is even lighter than the X Pro. Which if you looking for a 80-20 off road bike then the rally is the bike for you.
The X Pro is still incredibly light but only a few kg more than the rally. It also has cross spoked wheels and tubeless tyres, quick shifter, ride by wire throttle and more rider modes. A more 50-50 bike but still very off road capable. Also the X Pro has a steering damper as standard which at motorway speeds made a difference.
A steering damper is available as an option on the rally and the rally I rode was on knobbly tyres and was flighty on the road at 70mph.
DB