It sounds like you are asking if the Weapon Proc Skills stack?
Yes, those do stack in that you can use multiple to have a larger pool to choose from during an attack cycle.
Malawiglenn’s Guide on game mechanics
The above is a good fairly well written guide and the creator of which should have linked to it… as it partially covers this in the attack replacers section.
Turbo-charge your auto-attacks with default attack replacers and WPS
This one will cover exactly how WPS attacks work.