Bruce is right. Momentum and pressure distribution are simply two ways of looking at the same thing.

The simplest explanation is that a wing deflects air downward producing lift upward, and a propeller throws air rearward producing forward thrust. The “how” involves study of pressure changes and can get complicated pretty quickly.

While both explanations are basically correct, the momentum exchange isn’t particularly useful to engineers who are designing stuff, so they nearly always delve deeply into flow and pressure factors. On the other hand the deflection explanation is pretty graphic and helps pilots (both model and full scale) to visualize effects of their control.