How member functions are implemented in C

Question

I read somewhere that member functions in C++ are similar to regular functions but with an additional implicit this parameter.

As a result, I assumed that this software would be unable to discriminate between two functions. 

However, the software executed successfully. 

So, was the above statement incorrect?

#include <iostream>

class MyCls {
    public:
    void func(int i) {
        std::cout << "Member" << i << std::endl;
    }
};

void func(MyCls m, int i) {
    std::cout << "Outside" << i << std::endl;
}

int main() {
    MyCls m;
    // Thought both would have same signature void func(MyCls, int). But program compiled.
    m.func(4);
    func(m, 5);
    return 0;