Do the iPad Pro M4 and iPad Air M3 have the same notch dimensions?

What notch?

iPads don't have notches like iPhones do if that is what you mean.

If you mean their general dimensions like height, width and depth, then no, they are slightly different.

Unlike some models of iPhone that have a notch in the display to accommodate the front camera and, where applicable, the FaceID sensor array - iPad screens don't have a display notch. For iPad, the camera and FaceID sensor are located within the display bezel.

if your enquiry relates to something else, you'll need to provide more information.