The cross-hatched backgrounds are pretty good, though. The 4 Rp corresponds to Type III, the 6 Rp to Type IV.
I couldn't find your examples on the reference site:
https://www.vsphv.ch/falschungen/sammlung/However, the fakes are so numerous the lists are far from complete.
There is a contact possibility on the (German language) website so you might try this avenue.