Main similarities:
-In both dramas, the FL & ML are each other's party B and party A respectively.
-Both FLs work with designing/marketing/advertising in a smaller and less known company.
-ML is someone with a high position within their company.
-Although both MLs seem kind of aloof and cold, they are both quite quirky and fun in their own ways. That is to say, they aren't just cold, indifferent, and one-sided personalities.
-Both FLs are quirky and charming people who will make you laugh, but they are also hardworking and know when to stand up for themselves.
-The story has multiple couples and side characters with their own story.

Main differences:
-PAWLBM is more about the FL journey at work and how she develops to become a better designer and person.
-HIAYS doesn't solely focus on FL work, but more on the company as a whole.
-In PAWLBM the romance is not as focused on and kind of develops more naturally as we follow the FL whilst in HIAYS the romance takes the lead more.
-PAWLBM also has a "cohabitation"/neighbor aspect to it

All in all, I definitely think you will like the other drama if you like one of them. They are both very similar in setting, comedy, and overall atmosphere.