Maybe but maybe not. These are powder skis so you are on soft snow which makes things easier to push around. Also all the skis have rocker (some more than others) and that reduces the length of edge engaging the snow giving the effect of a shorter ski.
FWIW my suggestions were deliberately in the 180s rather than 190s because your skiing ability is an unknown factor and 180s are a safer bet. If you said you were an expert or strong advanced skier by Western standards (oops I just offended a whole bunch of easterners) then I would also be recommending in the 190s. Having said that to be realistic the difference between 178 and 190 is 4 3/4 inches which is only a couple of inches front and rear. Add some rocker with a real powder ski and it's not such a big deal.
Edited by Castle Dave - 11/6/14 at 6:47pm