In most cases the up rated and full rated version of a pump have the same performance but in this case there is a slight difference. Although both the SP3010EECZ and a SP3010X15AX use the same wet end, the SP3010EECZ is using a high efficiency full rated motor where as the SP3010X15AX is using a standard efficiency up rated motor. The motor amp label rating on each motor is the maximum draw that a motor can support but it is NOT what the motor will actually draw when placed in the plumbing system. What Hayward may be referring to is the label AMP rating being the same on both motors which is possible and without seeing the labels myself, I can't confirm that.

But according to CEC measurements on both pumps, the high efficiency motor will actually draw about 5% less than the standard efficiency version of the same motor while delivering the same flow rate. So I think Hayward is misleading you on the actual amp draw of the motor.

Also, I have found that the Hayward reps are hit and miss. Some know a lot while others are clueless. You have to keep calling to get different reps before you find one that really knows what they are talking about.

When sizing a pump, it is better to compare head curves than it is to compare THP. The head curve determines the flow rate on the plumbing system. The motor is there to run the wet end and the motor label really doesn't give you all that much indication of how the pump will perform.