It would vary depending on the people, but if we are doing counterparts then:
-Miranda and Norman’s mutated forms are a bit similar so it would cause some confusion before they agree on how fun it is to tear people apart if they get in their way as well as scenarios that forced them into that form.
-Max and Alcina would probably mock either and ask if they are compensating. Max wants to know if Alcina actually eats anyone with that large mouth while Alcina says that at least she’s not still reliant on an outside power source to increase her power.
-Neither Flint or Donna have a mutated form (unless you count Flint making himself kajuu sized with the sand). They just get to relax somewhere quiet and chill.
-Curt and Salvatore would want to further study each other as well as their additional abilities. (As a bonus, Curt isn’t grossed out by Moreau’s form, which the latter would appreciate).
-Karl would taunt Otto over how his mutation just grants him an extended range and strength but not much else–not even any protection. Otto wants to know how Karl is physically still alive given how his mutation effects his body while also analyzing the form in case he’d need to attack back.
The only two pairs (besides Norman and Miranda) that share similarities (and took inspiration from the lords’ designs) are probably Otto and Alcina and Max and Salvatore.
-I think Alcina and Otto would both be impressed by their overall appearances.... but of course Alcina is such a man hater that she wouldn’t show much respect towards him. Otto wouldn’t give a shit since Alcina is still RE’s equivalent to a vampire and would want to stay away from her regardless of what form she’s in. (And before you ask, no he’s not interested in Alcina in the way that many of her fans are into her. He’s still a married man in the au after all).
-Max and Salvatore have the same ‘humanoid body hiding in the monster’s mouth’ design.’ But Max wouldn’t want to go within even fifty feet of Salvatore’s mutated form since he’d find it gross. Salvatore would want a chance to study Max, but he wouldn’t want to be friends with the guy.