As mentioned, several differences. My Son knows all of them, because his is a Murray, and he researched it, but I only know a few. The cowl is longer on the Murray and the window openings are not squared off like the Briggs, but more rounded in the corners. Also, we are all familiar with the usual sweep of the cowl/windshield post that distinquishes most 1928-29 Fords, but the Murray does not do that , and is often mistaken for a '30-31. I also think the Murray only came in fordor versions, but could be wrong on that.
Some parts interchange, some do not. See how the windows are more roundish in the picture below?
Don