No. Mark uses a sort of hydroboost setup. It's not compatible unless you want to drag the whole system over which involves running lines to the power steering
The 1991-1992 Mark 7 use a different type of rear brake. It was used only those two years, and on the 1993 Cobra R (contrary to popular belief, and Ford's own M2300-K instructions, the Cobra R did not get the same rear brakes as 94-98 Cobras) . It's a 10.5" vented rotor with a Varga caliper VERY similar to the Sn95 caliper. Unsure of the piston size, but checking rockauto.com shows it to be a 2.12" diameter piston (almost 54mm). If it is a 54mm rear caliper, you can use the same brake setup as a 84-86 SVO as they also use the same 73mm front brakes as the Mark 7 and a 54mm rear caliper
The SVO Mustang is similar to the mark 7 and uses a 1 1/8" bore MC. I beleive the MC on the Mark 7 is the same, but steel. It can be used, but use your current vacuum booster. The issue will be doing a 3-2 port conversion using an MC threaded in SAE on the car with metric lines. I beleive MM sells the adapter kit
http://www.maximummotorsports.com/store/index.php?main_page=index&cPath=49_140_517_520_539