Please see
this post for the "official" nickel.yaml file for both firmwares 4.38.23552 and 4.38.23555.
From a kobopatch *.yaml files (nickel, libnickel.so.1.0.0 etc) point-of-view 4.38.23552 and 4.38.23555 can be considered the same. I believe any patch which works in one should work in the other without alteration.