There's not a lot of information regarding the features on the EC-145 v4.0 alpha (it's not even a beta so do expect some bugs and unfinished features). The model seems a bit different on some areas (which need some work) but the main differences lie on the flight dynamics.
This is a companion discussion topic for the original entry at https://www.helisimmer.com/news/rotorsim-released-ec-135-v4-alpha-x-plane/