Who is the irl actor equivalent to Kevin Pearson??

Jim Parsons. Both were in hugely successful sitcoms, have done theater (tho Parsons has done a lot more of that than Kevin), and had successful, smaller movie projects. But they're both best known for that one long running comedy role, and for playing in a spin off of it (altho Jim Parsons doesn't appear in most of Young Sheldon, he was the narrator)