What if somebody independently came to similar or worse results and only then read about the research - with possibly more results - made before that? Given th

What if somebody independently came to similar or worse results and only then read about the research - with possibly more results - made before that? Given the amount of information available, it could often be the case of independent research into something which is known and available for some time. If one only learns about similar - and possibly greater - results after making one's own, and wants to talk about the work done - should one cite other, possibly earlier, works?