Tim, this hasn't been my experience with camera's and a scope. Usually some amount of compensation is required, you can go in to the maintenance menu and get two camera's to be the same through optical head block shading, and white and black shading, but often most camera's I get are not matched (even if they're from the same rental house)
Also a fun trick (that I've seen in action but never used) is dialing down your blacks, or leave them at factory settings and then make everything but true black "milky" in information in the y-gamma setting. But test out I guess and see if that works for you.