They’re definitely in the same tier. They have different skill sets, but bring a similar impact to their team.
FWIW, here is Crosby vs top 10 players in ppg for his first 9 seasons (2006 to 2014) and McDavid vs top 10 players in ppg for his first 9 seasons (2016 to 2024)
2006-2014 (min 300 GP)
Crosby - 1,40
Malkin - 1,22
Ovechkin - 1,20
Thornton - 1,11
Spezza - 1,06
Datsyuk - 1,06
Savard - 1,04
Stamkos - 1,04
Kovalchuk - 1,04
St. Louis - 1,04
2016-2024 (min 300 GP)
McDavid - 1,52
Kucherov - 1,34
MacKinnon - 1,24
Draisaitl - 1,23
Panarin - 1,16
Matthews - 1,15
Crosby - 1,15
Pastrnak - 1,11
Kane - 1,11
Marner - 1,11
Similar environments with Crosby/McDavid separating themselves from the pack with 3-4 other players and then a logjam from 5th to 10th.