>>9805929I'm looking at the instructions of my 99% done 9.13 (enjoy this shitty flash shot) right now.
Yeah, it has a separate "9.13" sprue, that has the top fuselage half, the cockpit fuselage sextion, vertical stabs and wingtips. IMO the fit of the wingtips is the weakest part of Zvezda's kit, but necessary, since 9.13's have subtly different wingtips from other Fulcrum variants (I believe most if not all SMT's are rebuilt 9.12's).
TL;DR Zvezda didn't half ass the engineering of either variant.