No interactions present.
This is the variant with long, rather rigid leaves. It has been called C. biebersteinii but we are told it is not a separate species, just part of the variation in Europe. I am not quite convinced.
This variant is maybe more common in the north, while C. tomentosum in the strict sense (shorter, less straight-sided leaves) seems to be the commoner in the south.
They grow together (remaining distinct) on the East Lothian coast.
Also, eh4652, see comments under your other observations about NOT adding redundant repeat identifications.
Lat/Lng: 58.9863, -3.1857
OS grid ref: HY319116