Wrestling is usually based on Babyface vs Heel booking. Having Good vs Good or Evil vs Evil is something of a rarity.
Rewatching SummerSlam '92, not only do we have a Heel vs Heel in HBK/Model, but there's also TWO Face vs Face matches in Macho/Warrior & Bret/Bulldog.
Was there a particular reason they ran three of these types on one show? Trying something new? Something of a non-continuity cuz it was in England? Or just coincidence they all culminated on one show?
Just coincidence. It was supposed to be Bret v. Shawn in a ladder match when the show was originally scheduled for Washington DC, and Davey got inserted into it relatively late in the game.