Sorry to interrupt all this carb fitment talk. I'd seriously consider checking for an air leak in that saw with a vacuum/pressure check. Being able to run with the choke on is an indication of a massive vacuum leak and rarely a carb issue.Saw an ebay auction that said no, they use different carbs but most advertised units don't specify.
I have an 026 Regular (not Pro) that finally, once and for all, is getting the attention it needs, which per diagnosis begins with a carb swap (only running with choke open, starting there).
Question: Do the 026 and 026 Pro use different carbs, or is the carb the same between them?