Oh, you know we love to talk about gauge!
Both sweaters are 16sts/ 4 inches stitch gauge. The Lionbrand is 32rows per 4 inches in garter stitch and the Knitty is 24 rows per 4 inches in stockinette st. The difference is because of the difference between stockinette and garter stitch. Garter stitch pulls the rows up so that it takes more rows to make up 4 inches. Don't worry so much about row gauge, since most patterns will tell you how many inches to knit, not how many rows. The critical gauge is the stitch gauge. Both are nice patterns, the Knitty, a little more of a challenge.