Hi Maciej, I have both skins and a pair of Salomon MTN Explore 95s in front of me here. Doing a test fit on the ski, I'd say that the 165-180 length skin will be a little closer to the middle of the range. If you wanted the 175-190 length, it would still fit with just a little less room to shorten and a longer tail on top of the ski. But maybe you like having a longer tail to grab when ripping skins! They both will work, your preference!
As for the length of just the plush, it's 155cm and 161cm.