How can I attach 2 cover pages to a document without changing formats of either

Both documents are odt documents but created with different formating. When I try to attach the cover pages it forces the following document to change margins, etc.

Please, edit your question following these guidelines.

Where your cover pages created with a specific page style? Maybe same name with different settings?

If you didn’t, do it with a manual page break between covers and main body so that you can swith to another page style.

How do you “attach” 2 cover pages?