12V Battery Cable help ASAP

I have ordered a genuine inverter coolant pump, was questioning about the engine water pump.

I’m confused about the second pump. Where does this one go? What’s the difference between G9020-47031 & 16670-21010?

Also can I use the Lisle funnel to bleed the inverter coolant pump?

Best way to drain the engine water pump? Is it by the driver’s side under the bumper?

 

Estimate shows required part numbers, have no idea where you see engine water pump.

Google or search PC

Prius replace coolant control valve
Prius replace inverter coolant pump
Prius bleed inverter coolant pump