Not even close to Pride.
I would say about Dream level or slightly larger. Dream just brought in more fighters around the world that fans recognized so for many fans they probably see Dream as bigger because of that.
Really, I'm not sure how good Rizin is really doing financially. Wasn't long ago, few years ago there was rumors of its possible demise. They seemed to have righted the ship on the surface. But Rizin in a nutshell is KSW, its appeal is really made for the the country it resides more so than anything else. Any attention or sales they attract outside of Japan is nothing more than the cherry on top.