Although I don't know if the FO who was PF at 0200 had been PF since Rio.
Think I'm inferring from the following:
Towards 22 h 10, the crew was cleared to start up engines and leave the stand. Takeoff occurred at 22 h 29. The Captain was PNF, one of the copilots was PF.
(BEA Interim Report)
The Captain proposed that the copilot take a rest due to the length of his shift. The latter answered that he didn’t feel like sleeping.
(BEA Synthesis note)
Therefore I'm assuming that the pilot who went to rest was the one who was called back around 2am, ie F/O 37, and F/O 32 had been flying since Rio.