Is baked mostaciolli the same as baked ziti?

Yes and no. As far as recipes are concerned, they would be the same. It's the pastas themselves that are slightly different. They are both classified as "penne pastas" due to their shape. The only real difference between mostacciolli and ziti is that mostacciolli has ridges up the side, much like rigatoni. Whereas ziti is completely smooth. Because of this slight difference I find that it takes a bit longer for mostaciolli to be cooked properly (and by "cooked properly" I mean al dente). So if you're used to making baked ziti and you want to try baked mostacciolli, the only difference would be the time it takes to boil the pasta. Hope that helps.