I would focus on getting the functionality back that was on the original seats in your TH, adding memory, ventilation, etc. that didn't come with yours may be a real pain...
You might try comparing the part numbers for the '17 and '19 seat modules, they may have changed... I know the '19 lost the fold flat when ventilated, but gained passenger power adjustment.Thank you! I’m very pleased so far. It’ll be a nice bonus if I can get the other features working.