I think putting both in 10%nbf is fine, but if you want to do a little detective work to see which was in which fixative ,then before putting both in you could

a: cut fresh tissue stain and see if any have formalin deposits
b. cut fresh and stain both for say cd20-bet you the zinc formalin is cleaner, stronger and better stained.

 good luck-just a little csi in me coming out.
                        dana
         

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