[joonoro]

In the past they were more similar, at least the NPC art style was. When they first started Rimworld they used a sort of Prison Architect art style for their NPCs as placeholders until they got their own art in (which they have now).

If anything, both Rimworld and PA are "clones" of Dwarf Fortress.

[nikdaheratik]

Except Dwarf Fortress has so many mechanics (not a complaint) that almost any game could be considered a "clone" of Dwarf Fortress!

[moomin]

Meh, Dwarf Fortress is just a clone of Dungeon Keeper with worse play-balancing. :p