They are linked.
By bus!
If you look at the detail of the bus services you'll see that, whilst that is not actually a lie, it's not usefully true either. Virtually every journey between the two lines needs a change, often multiple
Leaving aside the question of what journeys it's actually valid on, which I would hope would be properly defined before it goe on sale. I can't see it being valid on the Coventry Stratford on Avon service for example - but that's in the
AONB▸ timetable.
I would expect it to be the services the AoNB directly or indirectly sponsors.