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Hi, I'm Mike G and I'll be glad to assist you. The 240V range will work on 208V but will not reach the full heat on the elements. As far as putting them on the same circuit, I suggest that each appliance be on its own. The overcurrent protection would be exact for indipendant circuits.
The range will need 4 wires. 2 hots, 1 neutral and 1 ground, should be on a 50A circuit. The fryer will have 2 hots and a ground and possibly a neutral depending on the nameplate information. The size of its circuit depends on the nameplate info also.
Using 2 hots from the 3 phase is single phase. The stated voltage is using the 2 hots.
Each leg has 208V to another leg, not a total. It will have 120V to neutral and ground.
You'll need a neutral and ground for the range. If you give me the nameplate info on the fryer, I tell you what is required.
No problem. Come back when you're ready to continue.