Is the netcode of KI at the point that the most successful online tactics are ultimately no different than the most successful tournament strategies?

Pretty close, yeah. There might be some very situational reactions that the best players can do offline that online won't let you do, but on the whole, it's very easy to "play like offline" (with the same combos, footsies, and anti-airs) and have it work 95% of the time. KI's online is best in class, for sure; if you've only experienced SF4 or MKX's online, you'll be shocked at the quality of KI's online play when you first try it.