[Walt Fricke]

They are - Tony could tell you which is which, as some later ones got fancier, but I'm not sure it is actually better. Use the search function here, and you will find discussions.

Me, I'd replace the screws for the thin metal diaphragm with Allens. Much less swearing all around.

If the steel diaphragm isn't dimpled or otherwise distorted where the spring loaded piece contacts it, there isn't really anything which needs to be replaced. Crush washers usually can re reused several times, and hardware doesn't usually go bad. Flushing the filter screen just requires the obvious disassembly and back and forth blowing of solvent.