"regular Guinness"?
The original "regular Guinness" (IIRC) was the "extra stout".....available in bottles and not very often on tap.
Then came the "Draught" version in the widget cans/bottles and also in kegs with special draft systems.
The original was much sweeter and somewhat less "drinkable".
I am certain that the "draught" is not the same as original Guinness........although it is quite good.
Also noteworthy......Guinness Draught has less calories than most beers and is not particularly high in ABV.