1) Efficiency: If you REALLY think that 2.5 degrees of shoulder angle and 13 thousands of an inch in shoulder makes a material difference, you're beyond help.
2) they CAN be loaded to the same pressure.
3). see # 2.

You seem to not be able to understand the definition of equivalent. And you don't seem to grasp the difference between the the trivial and the significant.

It's been real.