Apparently there is when reading ISO, Microsoft, Apple, Google, IBM, Microsoft,... documentation.
Guess what, we even used to have a famous magazine called "The C/C++ Users Journal".
Agreed. There Are differences between c and "c in c++" but no more than python 2 and 3 or c++11 and c++17
Alternatively, you could have C/C++ as a third, discrete category somewhere in the middle of the C <---> C++ spectrum. For people who like namespaces, or overloading arithmetic operators for mathy vector/matrix/etc stuff in order to make the code more readable.
C+?
C+=0.5
:)
While you can essentially write C in almost any language, C++ is particularly well suited to it.