Technically the answer is no. The chances of somebody being exactly 50/50 on some function is infinitely close to zero. A lot of people, including myself, hover closely between two though. However upon closer inspection, you're likely more of one than the other.
It's just a matter of identifying your inane preference in the usage of the 8 cognitive functions. To use myself as an example, some people (mostly Ne dominants) see me as an INFP because I'm always eager to jump into something new and they identify with portions of my thinking style as Ne. Yet I'm INFJ in that Ni for me is stronger than any other function. Which makes me INFj. Lower on the judging preference but still a J.