I just booked our first FC tickets.

BOS-MUC in F. MUC-OPO in J. 12 hour layover between - both on LH.
From what I've read in this thread, we appear to have access on arrival. However, I'm confused by "ticket must be the same day" - our flight from BOS is a redeye, departing the evening before it arrives in MUC. Will we still have access on arrival that morning?
Also, the flights are:LH425 / A380-800. (arriving from BOS)
LH1788 / A320Neo (departing to OPO)
I'd love to use the satellite FCL, if we are able to - if not I have access to Senator lounges - any advice?
Thanks!