The Memphis version is listed as Sweet & Spicy. The KC version is listed as Sweet & Smoky.
Side-by-side out of the bottle you can tell the Memphis is just barely a bit spicier and the KC is just barely a bit smokier.
The most noticeable difference is that the Memphis version has little onion bits in it.
The difference in taste is so subtle that I'm sure if I had each on some ribs I couldn't tell the difference.
Did the Texas style have black pepper for the kick? Those silly Texans just love their black pepper.
I'm glad you said that about the Carolina style because I want to try it on pulled pork.