The wartime XIVs did not use clipped wings that I've ever seen. Photos of 41, 91, 350, 17 squadrons etc show them with full span wings. There was much more use of clipped wing XIVs postwar. It was an easy thing to switch and with the advent of jets the XIVs were going to be much more used in the low alt, ground attack role as the IXs and XVI's were when the XIV and Tempests essentially took over the pure fighter job from them.