From this link :
http://forum.keypublishing.com/showt...gs-in-Portugal
"The 3 Hudsons, 1 C-47 and 2 Liberators at the back were all impounded by the Portuguese, the C-47 on left was G-AGJS , lend-lease on the KLM/BOAC Bristol-Lisbon service, the Lufthansa DC-3 foreground was D-ARPF seized from KLM, the DC-2 behind was Spanish and the Lodestar to the right was CS-ADD of AeroPortuguesa."
Photo from Museu do Ar, Alverca, Lisbon
One B-24 interned in Portugal was this one: 42-40772 Scheherezade' 564th BS, 389 BG. Not at all sure it is one of those pictured.
http://www.americanairmuseum.com/aircraft/19377
There is also a discussion of the B-24s here:
http://www.oocities.org/tavaresl.geo/research.htm
Link mentions 42-40772 and several others including a Coastal Command Liberator BZ730.