Schoeps and Neumann follow the IEC standard which (since it is also an ISO standard) applies in the United States as well, via ANSI. It is not "their own" standard; there is no such thing.
Pin 1 is always the shield contact for XLR connectors unless someone is being downright perverse and stupid. As with a single-channel XLR plug, pin 2 is hot and pin 3 is cold for channel 1, while on the other channel, pin 4 similarly is hot and pin 5 is cold.
If the Shure VP88 is wired differently, perhaps that is because it is a decades-old microphone design by now, and until some time in about the 1980s most U.S. manufacturers routinely ignored (or were even unaware of) international standards. They've grown up a lot since then, fortunately for us all.
--best regards