The cryo-EM structure of the spike trimer (PDB 6ZB5) is in closed conformation. I have downloaded pdb file and map (EMD_11145) files for the locked conformation. I have aligned the map of the open conformation (EMD_11146) to the closed conformation (EMD_11145) using chimera->Tools->Volume->fit map. How can I obtain cooridnates in open conformation? How can I map pdb file to the open conformation? Should I first map the monomer or whole molecule as trimer?

Could you please advise how this can be achieved?