Their minor league lines are both not very good.
Of course, Henriquez is 4 years younger than Kowar and has 1 great year preceded by two decent months at the major league level.
Kowar's ERA has dropped in each major league stint after the first one. The progression was horrendous, really bad, bad, and finally adequate for the last arm in the pen.
He missed all of 2024 and the first half of 2025 with Tommy John surgery. Maybe he's finally healthy and ready to do something. Apparently he also missed the last month of 2025 with a shoulder impingement, so maybe he's not
Edit to add: I'd tell you whose stats are whose, but I don't remember.