The Gamma uses the same chip as the s21 pro and therefore gets roughly the same 15 J/TH efficiency. However the s21 pro is 195x as powerful. So you'd need 195 gammas to equate to the hashpower of 1 s21 pro. That would be $32k worth of gammas to reach the hashpower of a single s21 pro that you could buy for $4k. 

Tldr nah wouldn't be worth it