Yeah nah. I reckon you can countCarlton and Collingwood won a third of their flags by 1920 and Collingwood had 11 flags before WW2.
You can only really count flags from 1990 as you are comparing state league flags with national league flags. Different rules, different players.
Of course pre 1990 flags are to be fully respected.
VFL/AFL flags as one given it’s the same comp, just renamed.
If you want to go down your path you should start at 1987 though as that is when WCE/Brisbane joined, it just wasn’t renamed AFL until 1990. Or maybe early 80s when SMFC went to Sydney?