Compile UE 4.18 with VS 2013

Is it possible to manually modify GenerateProject.bat file to force using VS 2013 instead of VS 2015?

We have to use VS 2013 because other legacy projects are using VS 2013. And we are using UE 4.18.

We briefly looked into UE build tool script, it seems VS2013 was supported internally, is this correct?