Carbon Fiber or Kevlar Clutch

I recently ordered what i thought was going to be a Barnett Dirt Digger Carbon Fiber Clutch, but they sent me the Kevlar clutch by mistake. Just got off the phone with them and found out that they don't even have the carbon fiber anymore, and my options are either send it back for a refund or keep it. I didn't get screwed out of any money. but..

whats the difference between the two. Is it worth it to go through the trouble of sending it back and ordering another elsewhere? kinda just wanna get it into my bike and get on the track if its gonna perfom pretty much the same. Tired of all this waiting. Thanks