The only part number for both in my notes is the one you mention. That doesnt mean it's correct, but that's been the consensus of the group grope in the past.

The Superior kit includes replacements for every sping in the valve body, including many that you really don't want to mess with. Unlike the Mercedes K1 and K2, the Superior springs are single element, as opposed to stock springs which are usually two or three light springs with a plastc keeper. The Superior springs may be a bit firmer than stock. This makes engagement somewhat less progressive, but not harsh. I'm currently using a Superior K1 and a stock K2, so don't be concerned if you have to mix and match.