AO is Audi Option, MO is Mercedes Option, JRS I believe is Jaguar option. They are basically different OE versions of the same tyre tweaked to suit the manufacturer's requirements for ride, noise, handling, etc. I would always be sure to run the same version on the same axle as they sometimes have slight variations in tread pattern, sidewall design etc.
Technically the correct tyre for your car would be the AO obviously, but I find the MO are just as good.
If the JRS isn't available in XL then I suspect its OE on something quite small (the coupe thing maybe), where as the AO and MO XL versions will be fitted to big heavy stuff.
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