Moving layers from document to another?

Hello,

I have 2 documents.....both 40 pages and have 4 layers on one and 5 on the other. The 5th layer in the one document has all the high res artwork placed. The one with the 4 layers, needs that layer for each page, which is already in the other document, same pagination.

Is there anyway to just move one particular layer (for all the pages) from one document to the other...without the Copy and Paste for each page individually?

thanks

babs