I have a Note 9 and Note 3 and tried the mimas stylus on my note 9 and it works fine so it is the same but the note nibs are rubber and the mimas is more hard and plastic so the note stylus does not slide on the mimas screen for instance. The good ereader store apparently sells Boox nibs as the replacements for the mimas. I could not find them on the amazon.de but here they are on amazon.com and Good Ereader.
https://www.amazon.com/BOOX-Marker-T.../dp/B07HQJDX4Y
https://goodereader.com/blog/product...tylus-pen-5pcs
https://shop.boox.com/products/boox-...tylus-pen-5pcs
Did the Mimas not have an extra nib in its Usb-C cable box, mine came with the puller and three extra.
Malcolm