I believe there is a difference where the main sills tuck into the cowl. Similarly, the roof rails should be slightly different when the join to the header. There were additional changes to the wood in several places in early-mid 1930 but it doesn't affect fit as long as all the pieces are part of the correct set. There will also be minor changes to the first two floor cross sills in mid '30 when the seat adjuster was changed from the large adjusting screw to the small version.