I think Digital Audio Service (from Hamburg, Germany) will sell matched pairs upon request. At least, they did so for my Gefells. Same price as Thomann's.
https://digitalaudioservice.com/schoeps-mk-41.html
I can't praise the people at Digital Audio Service enough! They have always treated me very well. They will usually give you a discount if you order multiple caps. Just ask them about it. However, they do not have most items in stock. Instead, they will order directly from Schoeps for you.