From a plan that was on here with rear bunks. We measured the rest on a 16" when we ordered the 17"
we talking 10cms.. For us it made a difference for the double bed.
Double 17" 1320x1955 vs 16" 1200x1955
large bunks 1850x700 vs 16" 1748x700
small bunk 1557x700 same in both
Moving from a 16" to a 17" you get an extra 10cm on double bunks and double bed. Later models had the bigger double, not sure what was moved to get the extra 10cm's
Buffet is 30cms so on that side not sure how they got the extra 10cm's maybe dinnette or robe smaller.
@Swerve has a 16" with bigger double maybe he can tell you what the bunks are in his?