Should a mamiya rb67 pro-s roll film back work on a Century Graphic with a Graflock back?

My film advance lever won’t advance after I release the shutter.

You have the answer in your hands, or, rather, on the back of your camera.

No, there's an interlock that's operated by the RB 67 Pro-S body. If you want to use a Mamiya 6x7 roll holder, get one for the original jes' plain RB67.

According to this http://mercurycamera.com/backs/complete-guide-to-graflok-23-backs-graflex-mamiya-rb67-horseman-and-mercury/, I'm mistaken. There's a dark slide interlock. See whether yours works with the dark slide fully in. It may want to be loaded with film too.