David Byrne
I believe the versions of AIM are the same, although the licensing for Discovery products is all subscription based, so that is one key difference.
For SpaceClaim, there are some differences between the variants (ANSYS SpaceClaim, SCDM, and Discovery SpaceClaim). The principal difference is the licensing, as I mentioned above.
The other difference is that Discovery SpaceClaim includes quite a few translators that are optional add-ons to ANSYS SpaceClaim (the classic stand alone version, not SCDM).
Please read through this document for recommendations on installing the various products: ANSYS Discovery: Preventing Unintended Changes to User Settings When Launching Multiple Discovery Products
You are navigating away from the AIS Discovery experience