Have you implemented your R5RS today?

http://lists.scheme-reports.org/pipermail/scheme-reports/2013-July/003660.html

>>9
eq? compares the addresses of two objects. eqv? compares the values. While C uses the same operator for both comparisons, it requires different syntax.

#include <stdio.h>

int main()
{
    int x;
    int y;

    x = y = 42;
    printf("(eq?  x y) => %s\n", &x == &y ? "true" : "false");
    printf("(eqv? x y) => %s\n", x == y ? "true" : "false");
    return 0;
}

Output:
(eq?  p q) => false
(eqv? p q) => true

So even in C, x and y are both similar and different at the same time. They require two different kinds of comparisons.