This is one lucky cat, with both a Sequential Prophet 6 and an OB6 from Dave Smith Instruments. And the keyboard versions at that 😻
Photo by Jon Sellers via the Facebook group Synthesizer Freaks.
The two instruments are quite similar in layout and overall architecture but have distinct sounds and other characteristics. The P6 is a classic Prophet. while the OB-6 has the distinctive sound of its Oberheim filters.