Well, it took longer than normal, but I finally found the info you need at the OS engine site. I compared the part numbers for critical pieces such as crankshaft, crankcase, and piston/liner. These were all the same.

Here are the two links to look at:
http://www.osengines.com/parts/ev11830aa.pdf
http://www.osengines.com/parts/ev11890aa.pdf