Borland C++ Builder vs Borland C++

I am using Borland C++ since several years to develop C++ applications under
Windows.
Could somebody tell me in simple words what's the main difference between
using the Borland C++ Object Windows language and the Builder versions? Is
it possible/practical to transfer existing C++ projects (*.ide files and
other C++ files) to a Builder environment? Any experience from developers
having followed this path would be extremely helpful.