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[guesst]

The arcade game had 2 different types. At first there was the 2 button one that if you tapped would do a light punch, if you hit a little harder would hit a little harder and if you smashed down would do a whopper. Later it was changed for 3 punch and 3 kick buttons, which proved to be much more popular and became the basis for the layout we all now know and love.

But it was common for PC conversions to be scaled down at the time. Lesser graphics and only 2 uni-power buttons, as seen here. But thats what was neccessary to bring the game home, so nobody complained.