Locations, just like characters, are unique. If you flip up a second Doomstadt, even if it has a different version, you will have to KO the first Doomstadt. It would have to have the "non-unique" tag, like the Negative Zones in Marvel Universe, in order to have multiple copies face-up.
Vs System RK1
Wow Minis RK2!
WoW TCG RK1
PM 1