Preston North End have been fined £12,500 for failing to control their players after the final whistle of the 2-2 draw with Bolton Wanderers.
Wanderers have been fined £8,000 for the same offence, it following a coming together of players of the September 1 clash at Deepdale.
PNE's fine is higher because of their past record, having been punished before for incidents at Wolves and Huddersfield in the last two seasons.
This incident happened at the end of the game, Ben Pearson shown a red card for a headbutt aimed at Bolton midfielder Joe Williams - the visitors' player was booked.
Pearson starts a three-match ban when North End host Reading on Saturday.
Announcing the decision on Twitter via their account 'FA Spokesman', the FA said: "Preston North End & Bolton Wanderers have been fined £12,500 and £8,000 respectively after admitting an FA charge of failing to ensure their players conducted themselves in an orderly fashion and/or refrained from provocative and/or violent behaviour during their game on 01/09/18."