Anyone have any suggestions on where to go on this?

I've got another pump motor question. My Super Pump II has a 2 hp motor with a sf of 1. I've found a 2 speed 1 1/2 hp motor with a sf of 1.3. If I calculated correctly that's a hp of 1.95. Would that be a near equivalent of my present 2 hp motor, or am I not understanding the sf comparison?