Upgrading Group Project To Unreal 4.18 and Working With Source Control

What are the required project folders/files to submit to source control if I’m upgrading a code project from 4.15.3 to 4.18.3 using Unreal Engine dl’ed from the Launcher? The goal is for anyone who gets latest to be able to open the .uproject file in 4.18.

Is it the Source folder inside the Project folder, then the .uproject, .sdf, .sln, .suo, and .db files?

Hey, not sure if youll see this but did you ever go ahead and try this out? What ended up happening? Did other members have to download every single file, or was it a relatively painless process?