I have only tried the 82 on a long time ago and remember it to be not quite as snug for me as the 888, therefore I would say the 184 is slightly more sleek/narrow than the 82.
Do you take a bigger size in 888? Narrower? Wider?
What particular aspect(s) of the fit (e.g. toebox width? toebox height? forefoot width? etc) makes you need the different size for the 888?