Eneroth Merge Layers
Merges layers into one. Useful when copying between models where corresponding layers have different names.
Eneroth Merge Layers

Merges layers into one. Useful when copying between models where corresponding layers have different names, e.g. when you've changed your layer naming convention or switch between languages.

The plugins also remembers the names of the purged layers (on a per model basis) and notify you when a layer by the same name is re-added.

Activated from Extensions > Eneroth Merge Layers...