http://www.truetype.demon.co.uk/articles/times.htm
Both have been around since 1931 since TNR is just a different name for Times's Roman (aka Times Roman)
But in the late 1980s, Monotype, the creator and owner of the rights to the font, slightly revised TNR to its present form. The current Times New Roman is not the same one that existed before the revision.
Thanks, my error.