VEVOR BBQ Access Door, 31W x 24H Inch Double Outdoor Kitchen Door, Stainless Steel Flush Mount Door, Double Wall Vertical Door with Handles and Hooks, for BBQ Island, Grilling Station, Outside Cabinet

Thank you, Stan N, for describing why the outside dimensions are the same as the rough opening dimensions needed to install. 90% of the answers to this question come from people who have no business trying to answer the question.

Is the same, your roughing and door just go inside and screw

The mounting brackets are aligned to the outside of the frame edge so the overall Dimentions are the RO dimentions. You can’t used the flange around the doors to overlap