The 'vert visors are most definately different. I bought some coupe visors in an attempt to swap the vert bracket and rod over but it is harder than it looks!
While I haven't tried in my mustang yet, I had done this years ago in a truck. I took the visor out, cut the stitching holding the cardboard onto the visor, then pulled of the factory material, some spray adhesive and new material, re-sew together and voila...
The Mustang visors are held in place around the mirror - you'd have to cut around it as well. It could be doable. I'll pull out the visors I have in my garage and take a look at them this afternoon.