Puredisk dancing

We need to switch our backup SAN from Pillar (SAN01) to EMC (SAN02).

I was wondering if we could de-assign a LUN from a SAN (just said SAN01) on media server (just said media01).

And then assign a new LUN from another SAN (just said SAN02) on the media server media01.

We do not remove the images of media01 from the old LUN from SAN01 on the master server.

Then we use the new LUN on the SAN02 for a week.

Then we need to restore something from the old LUN on SAN01.

Can we unassigned the LUN from SAN02 and re-assign the LUN from SAN01 on media01 and be able to restore it ?

thanks