Good video showing some differences according to the manual:
https://insideevs.com/reviews/404253/video-tesla-model-y-compared-model-3/
Note- I didn't see in this video any reference to a large difference in the HVAC- that being that the Y includes an energy saving heat pump:
https://electrek.co/2020/03/13/tesla-model-y-has-a-heat-pump-for-consistent-range-in-cold-climates/
https://insideevs.com/reviews/404253/video-tesla-model-y-compared-model-3/
Note- I didn't see in this video any reference to a large difference in the HVAC- that being that the Y includes an energy saving heat pump:
https://electrek.co/2020/03/13/tesla-model-y-has-a-heat-pump-for-consistent-range-in-cold-climates/