12.4.16.1 Term Comparison

int PL_compare(term_t t1, term_t t2)

Compares two terms using the standard order of terms and returns -1, 0 or 1. See also compare/3.

int PL_same_compound(term_t t1, term_t t2)

Yields TRUE if t1 and t2 refer to physically the same compound term and FALSE otherwise.