What the difference between a honda CM91 and a honda CM91A? CM91A1449334?

What the difference between a honda CM91 and a honda CM91A? CM91A1449334?

A suffix for some Honda's indicated a 'Automatic transmission' like on the 750, 450, 400 motorcycles or Autoclutch as used on some of the Cubs from 50cc to 125cc- maybe some larger models. CM91 is a nominal 90cc with a 3 speed tranny in earlier years 1970 or so- the 'auto clutch' meaning no need to pull in clutch lever on handlebars was around at that time- just toe up or down the shift lever and first 1/3 movement did a clutch pull/disengage. That is about nearest idea for the A suffix I can think of, A for 'American Market' maybe? - that was identifier for some vehicle with varying sales and certain market legal needs, meant a English gauge and speedometer in miles instead of kilometers, wide set turn signals and sealed beam headlights sometimes. Do you need a clutch lever pulled into shift?