KZ1000 MKII question

Just curious to know:
For 1979 MY, on Partzilla, there are a KZ1000A3 and a KZ1000A3A.
Anyone knows what the differences are (if any) between those two models?

For 1980 MY, there is only a KZ1000A4 (no KZ1000A4A).

Thanks!

As far as I know they are the same exactly. A3A was the later production of the model year vs the A3. This era was when things were changed mid year to satisfy tightening rules for safety and emissions, but I don't believe either effected the A3/A3A.
There were guys that believed the A3A was Canadian, and A3 was USA, but this is not correct. I have an A3A from USA I've owned for 40yrs.

The carbs may be different but that's a guess.