Knitting circular, I sometimes use a smaller size needle for the left, it makes it quicker and easier to knit with the right needle in the size I need and my interchangeable set makes it easy to do. Different sizes makes sense to me, different lengths doesn't.
Cheating is an option. . . . Cheaters never win and winners never cheat, but smart knitters who want to retain an iota of sanity do, cheerfully. ~~Kory Stamper