Any differences between 6-0202 and 6-9113

[cavmedic 0]

I need to replace my idler sprockets and bearings on my 6-9113 . The parts diagrams do not have a listing for replacements for these BUT the 6-0202 does on parts tree.com . They are both 37" blowers , the only difference that I can really tell is the years as the 6-9113 is a 1974 complete package and the 6-0202 is a 1975.