At the raging fanboy war starting here. I happen to have liked both VII and X almost equally as much as each other. Relax, they're just some games.

Anyways, here's a few more 'coincidences' (In my experience there is no such thing as coincidence) throughout the FF series:

FFT: References to FFIV (the ruins of Baron Castle, the Tower of Babil, or at least the ruins thereof, the old flight school where the pilots of the Red Wings were trained, etc) as well as VII (Cloud, Aeris the flower girl, materia, etc).

FFVIII: References to FFIV (Gilgamesh, the Lunar Cry, etc) as well as VII (Zell's limit breaks are almost identical to Tifa's and he looks almost like the result of Cloud and Tifa getting married and having a kid)

FFIX: References to FFIV (Garland, the Invincible, the Red moon) and VII (Zidane's comment in the Lindblum weapons shop, the Tantalus band playing the Junon Military Parade song) as well as even I, II, & III (Vivi looks like the original Black Mage, there is a Red mage in the bar in Alexandria that looks just like the original Red Mage, Garnet was wearing the original White mage robe at the beginning, Garland, etc).

FFX: References to Earlier FF where the summoners have horns (when the Ronso say that they will carve a statue of Yuna with a great big horn), FFVII (Shinra, Shinra's comments about the Farplane, which looks just like the lifestream in FFVII with a better special effects budget, the sphere's similarity to materia, etc)

FFXI: References to FFVI (three different types of Magicite are required to complete some missions), as well as FFV (the Job system).

That's about all I can come up with right now. Feel free to add to the list.