Yes you can swap it out.
Field strip the shotgun and remove the forend and action bar assembly. There should be a nut inside the front of the forend that secures the fore grip portion to the cylindrical portion/ action bar that slides over the mag tube. You will see two "notches" in the face of this nut, opposite each other. You can buy or fashion a tool to engage these two notches. Simply unscrew the nut, slide the fore grip off. The nut has very fine threads.
"People live too long, dogs don't live long enough" - FTF Member-