Similar word to selfsame:

Xerox, aforementioned, aforesaid, carbon, carbon-copy, clone, coequal, comparable, compatible, corresponding, ditto, double, dupe, duplicate, equal, equivalent, identic, identical, in the same manner, indistinguishable, interchangeable, like, likewise, look-alike, related, same difference, similar, similarly, synonymous, tantamount, twin, very