Can someone explain the difference between an UP Rate Pool motor vs FULL Rate

I hope I dont have to return my motor I ordered a replacement motor for my Pentair Whisper Flo Pool pump The old motor is a Smith  USQ1152 E46412 Model C48L2PA103A3 Volts 115/230 1.5 HP Amps 17.5/8.75  1.5 HP RPM3450  FR 48Y

New one smae HP 48Y and amps but is a full Rate motor This web site reccommended  the UP Rate  motor but I don’t understand the difference.

Have you read This InyoPools article ?

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Thanks for pointing out this article> It answered my question !