Yes, there are surely much better examples even within this group of manuscripts of images developing independently. The one comes to mind where suddenly a dragon in a castle is defending certain trees.
Still even here we see a small shift from something that might be oak in the Egerton to definitely oak in the other MSS. I think this can only be explained by the formation/evolution of some convention, since there is no particular reason to put ivy on an oak branch.
Just idle speculation, I wonder if the association between mistletoe and (holy) oaks might have pushed the oak as a chosen host for ivy as well.
Still even here we see a small shift from something that might be oak in the Egerton to definitely oak in the other MSS. I think this can only be explained by the formation/evolution of some convention, since there is no particular reason to put ivy on an oak branch.
Just idle speculation, I wonder if the association between mistletoe and (holy) oaks might have pushed the oak as a chosen host for ivy as well.