Some props are more efficient than others. The more efficient the prop, the lower the current requirement.

It is quite possible for two props of the same size but from different manufacturers to have very different efficiencies. So the results you are seeing are probably real.

To see some examples, try the Babcock calculator:
http://www.badcock.net/cgi-bin/powertrain/voltprop.cgi

You can select your motor and then try different props. You'll find differences in current consumption even when the prop sizes are the same. In some test results I saw on another forum, the MAS e-props were less efficient than APCs. But even within the same brand, certain sizes are more efficient than others.

It pays to test, as you are learning.

- Jeff