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As far as I am aware NIJIII+ and NIJIII++ are not official designations. NIJ officially only tests for NIJIII and NIJIV. The III+ designation was introduced to act as an intermediary between the two that wasn't official and it is used by manufacturer's to indicate that it should stop some threats that the standard NIJ III does not. I think it was specifically in reference to some newer and higher velocity loads of 5.56. The plate was only officially tested for NIJ III by NIJ as III+ doesn't exist even though the manufacturer suggests it exceeds standard NIJIII spec.
You are correct, the only difference between level III and level III+ is that III+ will stop 5.56 green tip armor penetrators.