The difference in size should not be a problem and long as the binary is compiled with the same options, although Debug binary should work fine on the Profile build so I am uncertain what would cause that without further investigation.
I am unsure of which branch you used to get the source code. I know you got it from GitHub, but which specific link (As there are different options)?

If you get the crash again, you can launch Sandbox via the Visual Studio Debugger, and then you can extract the call stack. Of course, since you only built the Game DLL it will only be useful if there are stack frames from that module. If you built the entire engine, it would be more useful.

SDKs :