I have doubts that this is going to work:
- Duplicate sensor pin: Your reading will be way off when you connect two sensors to the same pin
- Duplicate heater pin: Both heaters will be active at the same time, effectively doubling the load in the MOSFET, which might fry as it is not meant for such a load.
Apart from this, it is not a “real” dual extruder but a 2-in-1-out. You might want to check X-In/1-Out Non-Mixing Extruder Config