Finsbury Park copes with huge crowds when Arsenal have been playing at home, but the difference there is that there are the staff on the ground to sort it out.
Big difference is most Arsenal supports do not carry large suit cases. The spiral stair cases that link the main line and tube lines are not Baggage or push chair friendly.
A large percentage of arsenal supports will be familiar with the station as they will go several times a year.
Arsenals flows are tidal not in both directions at the same time.