Hi Cornelis,
Thank you so much for your kind lines!
I surmised you owned that booklet.
Good question - I'm not sure. The style is grotesquely zoomorphic and characteristically Gothic anyway, just like the gargoyles on Gothic cathedrals. They were the nearest I could get to 'gryphon heads', so - sorry if they don't perfectly match.
Good night to the Netherlands and an obviously fine collection there,
Michael