How can I effectively merge two UE4 projects into one?

Hello everybody,:slight_smile:
I was working on an UE4 videogame project with some fellows, and we found a problem that could turn pretty messy.
We are all students, and pretty inexperienced in Unreal Engine. The point is, that we all worked separately on different tasks (textures, props, triggers, lighting, etc) and on different projects
(all based on the basic whitebox), and now we have to combine all the different versions.
I’m currently trying to combine the project witch the definitive props and general outlook, with the one with the final textures.
I don’t know if there’s a way to do it automatically (taking into account that the final props project has one extra room in it), or if I have to texture it all over again! :frowning:
Thanks in advance!
-Salva