How similar are Boost filesystem and the standard C++ filesystem libraries?

I need a filesystem library for use with a C++11-capable compiler or a C++14-capable one - so it can't be be from C++17. Now, I know that the new filesystem library is based based on Boost's library of the same name; but - are they similar enough for me to use the Boost library and then seemlessly switch to the standard version at a later time, without changing more than, say, a using statement? Or are there (minor/significant) differences between the two? I know that for the case of variant, the Boost and standard library versions differ quite a bit.