Since you ask:
Let's for illustration call pollen plants P1 and P2, and the female G1.
Pollen plants - Each one will have a chance to self pollenate (producing S1 seeds - P1xP1 and P2xP2).
- Each one will also have a chance to be pollenated by the other pollen plant (producing two F1 crosses - P1xP2 and P2xP1)
Female plant - Will get pollenated by both pollen plants, producing two F1 crosses. If pollenated naturally the way you plan, seeds from the two different crosses will be scattered throughout, there will be no way to know which cross an individual seed is. (P1xG1 and P2xG1)
If you isolate pollen and apply to individual branches on the female plant, you would get identifiable F1 crosses (P1xG1 and P2xG1. Knowing what your seeds are can be helpful given the effort and expense involved in a grow.
Any other questions, fire away and I will try to help.