I don't have access to a 336 parts manual. Looking at pictures the fenders look close. The 276 has 24" tires and the 336 28" tires and you can note how the tires are closer to the fender on the 336.
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Here is photo from YM336D book. The part numbers are the same as the YM276, however, I am unsure of how to interpret the C=T/# and the D=T/#. I think that the D=T/#42716 means that part applies to serial numbers AFTER 42716 and above. What is the D=T/# mean?