it must be the same, otherwise Adobe would update the information in the documentation, it would be indicated as a new function, etc.
ActionScript 3.0 / Flash Player 11 - flash.display.BitmapData :
In AIR 1.5 and Flash Player 10, the maximum size for a BitmapData object is 8,191 pixels wide or high, and the total number of pixels cannot exceed 16,777,215 pixels. (So, if a BitmapData object is 8.191 pixels wide, it can only be 2048 pixels high.) In Flash Player 9 and earlier and AIR 1.1 and earlier, the limit is 2.880 pixels high and 2880 wide.
source share