Off the top of my head yes, I think you can!
Based on a quick investigation KPUK list one exhaust, the same exhaust in both Pre and Evo sections. It states:
Rotax Complete Exhaust System | From Kart Parts the largest Kart part distributors in the UK with a massive stock range.
www.kartpartsuk.com
Complete Rotax Exhaust System Latest Spec
As used with all Rotax Engines
Including Junior and Senior Evo Engine
Can also be used with the Minimax Engine
However also worth investigating the brackets too.
@LeeAllonby how did you get on going from your Pre Evo to Evo and the exhaust brackets?