The 911 is the overall model, the generational spec is the 996, 997 or 991 (the latter being the current model).

Like the BMW 3-Series has it's E36, E46, E90 and E92 generations.

I'm sure you're right though, yeah, they'll be the 997s that were at the WRC round. Guessing they're completely different chassis to the one entered at Rally GB too.