i work for a rental company and policy is to swap out the chain after each use. and alot of the chains show no to little use. figure i'd buy them from work and save $$$ if i could do this. saws at work use oregon #72 3/8" .050 pitch. the chain i use on my husky 142 is #91 3/8" .050 pitch. whats the difference in the 72 and 91 and will this work???? i know the links will be differnt but we have the tools to make chains thus i can make them smaller or larger if needed.