Will the native trees pollinate one bought in a nursery, say a Pawnee for example, or vice versa store bought pollinate native?
Yes natives will pollenate other varieties & vice versa.
Trees need to be within 400' (feet) for consistent pollination. Less is better.
The pollen can travel up to a mile or so if wind conditions are right at the right timing.
This far apart crop will vary considerably, usually being poor.
There are a few self pollinating varieties, but, crop will vary from year to year, when conditions are poor you can end up with little to no crop. Generally speaking nut quality is not as good on self pollinating.
Most folks plant desirable varieties in at least pairs unless another pecan is on a neighboring property within 400'.