Most parts (including barrels and chokes) are interchangeable between Mossberg 500s and Maverick 88s.
Aside from the different safeties, a few other parts are simplified, and the Maverick may use one part where the Mossberg uses two to do the same job. (This is similar to what Savage did with their Axis rifles to reduce costs).
Also, 500s and 88s are both assembled in the US, but some parts for the 88 are made in Mexico.