Not only do they have basically the same vibe, they both share alot of similarities:
+ Both MLs are geniuses (Maths in Perfect and Casual, Science in Put Your Head On My Shoulder)
+ Both MLS are sort of cold to start with - but are extremely caring and protective, jealous of a SML at the beginning and do their best to make the FL stay
+ Contracts: In Perfect and Casual it's a marriage contract - in Put Your Head On My Shoulder there is a contract for the FL to keep living there by her mom
+ A lot of fluff
+ Both have hardworking FLs where the ML sometimes helps out in cute and supportive ways with their knowledge
Funny note, both FLs like snail noodles which the MLs hate lol