OK, I think you’re misunderstanding.
The aftermarket hotend you have has the thermistor and heater for the X1. You can order the thermistor and heater from the link I gave you and swap them out. Once you do that you can install the aftermarket hotend without issue.
Actually if you’re careful you could attempt to swap the one you have over to the aftermarket. You just need a little thermal paste. You can reuse the clip if you’re careful.