If you could find the aK (free surface area) info on them, and the ones you want to buy, that would be a beneficial comparison.
Electricity makes refrigeration happen.
Refrigeration makes the HVAC psychrometric process happen.
HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.
A building is NOT beautiful unless it is also comfortable.
Shophound, here's a picture of the max flow registers I found at HD. There is alot more spacing when compared to the existing registers.