Chainsaw Repair

I've got 2 questions for you stihl aficionado's. How can you identify a 10 mm cylinder and is it all in the cylinder that makes these saws so good or is it the crankcase too?

The reason I ask is that I recently went thru some of my junk and came across an 044 cylinder in good shape with the angled top fins. I'm a little curious if it is a 10mm version and what kind of gains I could see over a 12mm version. I've got a good running 044 that I could compare it too - I would just switch cylinders and try it out. But, I'm not positive the this cylinder is a 10mm version. Any markings I can go by?  Would I have to check the timing numbers to determine?  Does anyone know where or if there is a difference in the port timing? 

Thanks,
JP

Didnt the 10mm's also have crank stuffers to help increase velocity by reducing crankcase volume ?

When I get a chance, I'm gonna check the timing numbers on the 2 cylinders. Hopefully someone will know the difference based on what I find. I think I'll do some timed cuts with both cylinders as well to see if t h ere is any noticeable difference.