If identical, a func() in C is faster than in C++?

Question

void func( args )
{
// a non small code body
}

If are identical versions in both C & C++ (no OOP or any other cpp feature), the C version would be faster?
If yes, how much, it worths implement stress-used routines of a project in C?

Answer 1

The C version won't be faster. The generated ASM will probably be the same, actually.