Differences between Pre 96 and post 96 XR250
 

I'm looking for some advice, I've managed to damage the valves and head on my 1991 XLR 250 and I need to replace the head.

The only heads I can find in breakers are from 96 onwards models, I know the XR250 was revised in 96 but what I want to know is will the head from one of these later models fit my 91?