Bronze gear necessary??

I would call Comp and just ask. I think the cam gear is made for the regular steel gear. Computer Controlled 210/220 Hydraulic Roller Cam for Chrysler Magnum
This is the one I am running. Shows billet but takes steel gear. I had the same concerns as you and after a bunch of research this is what I found. I did not read the link about oil pump gears but brass is softer than steel. I would use a treated steel gear. Just my thoughts.