Yep. Those are the same thing. The Maverick is a lower end M500, but only in the fit and finish. Stuff like barrels are exactly the same and interchangeable. The 88 has a 3" chamber too.
Academy Sports wants $219.99 for the Maverick Combo. Gotenda says they don't have any in stock.
https://www.academy.com/shop/pdp/mos...action-shotgun