Is it possible to have consistent development for Windows Universal and Android apps?

I recently tried to port our game in to a Windows Universal build. It failed due to multiple .NET libraries and methods being unavailable.

The reason for this is according to other sources that Windows Universal doesn't have the version of .NET that Unity uses in Android. I believe they use native .NET on Windows devices, and a customized one on Android. Is it possible to have it use the custom version in Windows as well?

Unity (v.5.2) or Visual Studio 2015 didn't provide any error messages before trying to build the WU package. Therefore I would like to know if there's a best practise on targeting a game for both Android and Windows Universal?