The 4th image wasn’t strictly for Random Battles, but rather for modes like Steel Hunt, Rampage, or Domination. 
Fair disclaimer: it’s very possible that an even earlier version of the loading screen exists, but I don’t have access to those early WoT clients. The absolute earliest WoT client I’ve been able to explore is version 0.4.5.
This limitation also applies to future evolutions of map loading screens particularly for Malinovka, Himmelsdorf, Prokhorovka, Ensk, Lakeville, and Murovanka. Alongside Karelia, these were the only maps available in update 0.4.5.
For context, version 0.4.5 dates back to August 2010, only eight months after the end of the alpha test.
Ithink they should bring back the burning map variants 😀 they at least offered some visual diversity 🙂
Don’t need any more diversity forced on us