As Roger said, yes they all work. But, they work at different speeds, and may have slightly different results.
I've used Legacy Pro Eco, Multigrade, and Kodak Polymax. Multigrade and Polymax are the same in use, but the LP Eco takes 90 seconds to develop (vs 60 for the other two) and the image doesn't start to show up until much later (around the 50s mark for me). So while the final product is the same, it takes longer and there's always a few seconds of faith while thinking "oh crap, did I screw it up?" until the image starts to appear.