I've tried both versions. The Russian version (with russian esp) is radically different from the Chinese version, most notably Lena's look herself. It also has less features than the Chinese version, I think. It's also in russian font (Cyrilic). If you put an English patch over it, it will summon the Chinese ver with English dialogues and whatsoever, though there's still some leftovers in Cyrilic, so long as the resource is there, but as mentioned before, it has less features. So just install the Chinese ver altogether from the beginning.
Still... Why does my Lena (chinese ver) looked different from the demonstration video in the chinese streaming site though? I noticed that her skin is lighter, has better face shape, and maybe it doesn't feature the mismatching body texture too? If anybody has a remedy to this, please let me know.