No, because more people folded unplayable hands before you and thus increased the chance of playable hands for the people behind them. Also board textures should look different (slightly). I dont know how much of a difference this makes, but you should open slightly tighter OTB 9-handed compared to 6-handed.

To give you an example for this:
Suppose a game with 3 players, you know bu/sb will not fold an ace and thus raise first in if they have one. Suppose the button folded to you and its your turn in the sb, you now know that the button did not have an ace, so there must be all 4 aces left in the deck and thus all Ax combos. You now also know that all non-Ax must be reduced because he folded a non Ax

Scenario 1: Relative Ax combo to all combos (50x49 - 46x45)/(50x49) = 15,51%
Scenario 2: Relative Ax combo to all combos (52x51 - 48x47)/(52x51) = 14,93%

If you were just 2 players you would not have this information, this effect is obviously cumulative the more players folded to you.

True, that topic was discussed in several videos here (smth about folding frequencies). So in 9max after more folds before us, we should expect stronger ranges in blinds, them having more Ax and other high card combos means we should open up little bit tighter

i fold 9h2c and the guy after me fold Th2d , hey bro Tc9c 2c2d is not a bad at all in 3 handed ? hahaha, i really think that your concept is a bit overrated bro' , it would not changed a lot :)