The units available at the top barracks are different in the two settlements. Vindabona, the capital, has a 'Great Hall of Heroes' while Carnuntum has an 'Assembly of Free Men'.
At the top level Carnuntum gains Celtic Chariots but loses Boii Champion, Naked Fantatics and Boii Noble Cavalry .
These are the buildings from Carnuntum (using the building browser).
Celtic Settlement
Levy of Clans and Tribes
Assembly of Free Men
Is it possible that the Scythian Noble becomes available in a settlement further to the East? I presume the same could happen for the Celtohellenic hoplite?
I had a look at a custom battle and could find no mention of a Caltohellenic hoplite, Scythian Noble, Scordisci Infantry or Helvettii infantry.
With the custom battles I can find a Deep Forrest Dacia and Deep Forrest but no Open Forrests - what are these called?
The above was for revision 510 - updated yesterday afternoon.