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Actually, they are probably just variant transliterations of the same name: in North India the contrast between aspirated and unaspirated is indicated by the t-/th- distinction, whereas in South India, typical, the dental-retroflex contrast is denoted by the same. Thus, unaspirated retroflex will be t or d in both transliterations, whereas aspirated dental will be th and dh in both. However, aspirated retroflex is th and dh in North Indian transliteration and t and d in South Indian, whereas the unaspirated dental, which is the one in nitin, is the opposite.

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Incidentally, contrary to what this site seems to say, nitin is probably not a word in Sanskrit. There is a Sanskrit nIti derived from nI, to lead, and means leadership, management, or good conduct. nitin could also possibly come from names like nityAnanda, or ever happy, from nitya meaning innate or everlasting and Ananda meaning happiness.