Replacing Single Speed Motor w/ Dual Speed Motor

[Sherra]

Is it possible to replace just the motor on my current single speed pump with a dual speed motor, or do I have to replace the whole pump?

If I can replace just the motor, does it have to be the same manufacturer, or do I just need to make sure it fits & has the same THP (hp x sf)?

Am I going to have something special done to my wiring? The pump is hooked up to a timer.

Here is the label from my current pump.
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