Hi Tom,
The information you shared explains the likely connection.
Also, if picture #1 above is viewed in full size, the inserted key with a pink fob shows up. It's a regular key and not the cylindrical burglar alarm type on the Gibson.
I think these are good freezers, and I'm happy to have magnetic gaskets and a soft-closing door. Our previous '61 Wards freezer had a latching door that required a good push, and wasn't as nicely appointed as the Penncrest.
I paid $150 for the Penncrest a couple of years ago. The Gibson is nice, but $500 seems pretty steep to me.