Mopar KH Caliper vs Mustang KH Caliper

So, the drivers side Mopar KH caliper has now come close to extinction. There are some passenger side still available. But I see the 65-66 Mustang KH calipers are almost identical, save and except the means to install the flex hose. Those calipers are readily available and almost half the price.
Has anyone tried this part swap?