The roller cams are the same between the mustang and the Ranger. Same part number ,same specs. However, the flat tappet Mustang cam differs in LOBE lift from the roller cam. They spec out at the valve about the same. The difference between the flat tappet and the roller cam is the follower ratio.
There are many people satisfied with the roller cam in their turbo motors. There are just as many people happy with the stock flat tappet cam. I personally prefer a roller cam. I like the reduced wear, and the reduced friction. They're pretty much the same cam. It's everyone's butt dyno that's different