I'm kinda confused... but I think you're asking if you can put the mylar head back on to an already converted mesh head pad. My answer is yes.
I could be wrong (but doubt it), so try it. I'll take you 5 minutes to swap heads on a pad. In theory it should work just fine. You might have to mess with sensitivity a bit, but since you're not changing the internal configuration, I'd doubt you would even need to do that.