MF,
Not sure, from memory the bases are different, all the Gardeners Choice ones I have had the motors were all good, usually just replace the carby and I off load them. Never had a base here that ended up with no motor so never had the need to try the PT motor, but it is a possible option.
I'm almost tempted to go after this pair but I don't want to get pinged driving out of my area at the moment
https://www.ebay.com.au/itm/Talon-Lawn-Mower/114199435970?
