ucrtbase.dll seems to be the universal CRT library that came with Visual Studio 2015 and later.
Visual Studio 2013 apparently had version-specfiic CRT libraries with different data structures, heap managers, memory allocators etc. and naming conventions etc. Thus, if a CRT (especially: memory) structure was passed from a source code unit that was built with one specific CRT version to a source code unit that was built with another, the application was likely to crash.
See also
The /Zl compiler option that prevents including the name of the default CRT library into object files.