FR24 shows GR 696 being operated by G-VZON today, but GR697 by G-COBO. FR24 has no record of VZON's return from EMA to GCI. However, Flight Tracker shows G-VZON operating GR697 but G-COBO returning EMA-GCI as GR100P. Although not always entirely reliable, Flight Tracker shows COBO's return at FL 5.0. Does this suggest that G-COBO has had pressurization problems?