So I've had both bikes I've had the 525xc. KTM and a few Outlaw 525s, I've always enjoyed the location of the reverse lever on the KTMs way better than the Polaris. In North Carolina where I ride it's tight trails and you get in hairy situations, so reverse is a necessity. So I looked into the swap essentially you need the KTM cable which is about $60 and you need the magura clutch cover assembly from the KTM and the lever, which is $15 and $20 after that it's all plug-in play it is a few inches shorter than the outlaw bike, bout routing routing the cable properly will solve that here's a couple pictures hope this helps someone.
Ktm reverse cable
Ktm reverse lever
KTM MAGURA CLUTCH res cover on ebay.