Yes, the 4# Wolff is basically the same as a Zev that is "labeled as 2#". Wolff makes 4#, 4.5#, 5#, 5.5#, and 6# FPS.
The 2 most commonly used are 4# with a lightweight striker and a 4.5# with the OEM striker.
The 4# spring "may" cause light strikes as well as weak reset or failure to reset with the OEM striker.
Anything less than the 4# FPS should be avoided.