If you go to haywardnet.com, the company's web site, you can see it. The SP 2 speed can be as small as 1hp, but the smallest SPII 2spd is 1.5.

The SP has a gold motor. The SPII is all black, streamlined (a la the 30's) with a gold label on the motor.

IF the HP is right for you, I don't see an issue (unless they charged you more). If it's too much, you'll need to have them replace it.

Both should be full-rated pumps, so the hp can be compared.