charging the hybrid battery

not that i recall, but i doubt there would be enough power in a similar sized battery.

not sure about the donor car software either

 

Probably.
But they may not be alive to tell about it.
Seriously NOT a good idea.

 

It is almost impossible to be able to do that. Toyota has a charger called THS which connects behind the inverter using the car orange cables to provide power to the battery. Also, connects to the battery ECU using 4 pins to control the main relays which connect the car side to the Hv battery and complete the high voltage circuit safely. The third cable is a bonding cable between the charger and the battery case. The procedure is 10 min and increases SOC by only 2%.

in theory, you could risk dying from electrocution and you could jump start the HV battery from another HV battery wearing insulating gloves, removing both service plug grips, using a ground jumper cable between the cases, use two more jumper cables directly to battery terminals bypassing main relays (EXTREMELY DANGEROUS), installing plug grips again and charge it for 10 minutes. If any cable slips, touches a wrong side or creates a short it would be an electric chair situation.

I would pay a dealer 1 hour of labor to do it safely with the THS charger.