It's really pointless to compare them.
When Jimmy Greaves was playing, there was on average 4 goals a game. Now there's about 2.7. He was playing 42 game league seasons but only playing once a week.
With Dixie Dean, things like the offside rule don't even exist, the quality of the football is incomparable, and most defensive tactics haven't even been invented yet.
Imagine how many Sergio or Shearer would get if he only had to play once a week, and every game had nearly 2x as many goals because defending was so much worse?
The reason people use "Premier League" stats is because 1992 is a pretty good marker for the beginning of this modern era of football. The offside rule gets close to its modern iteration, the pass back rule comes in, the European Cup becomes the CL and the PL is created which creates this huge influx of money at the top. The Bosman rule changes up transfers across Europe as well and everyone (except germany) settles on 38 games a season.
It's a good bookend for modern football, and comparing across the era's is an exercise in futility IMO.