I'm a little sad now. I had no idea how much was actually different until I saw those screencaps.

By the way, you keep hearing different "requirements" because there are people who don't want to just believe that all 1.0 characters count in this. It was said that story-wise, even if you weren't there gameplay-wise, all of us were part of the Battle of Carteneau. All of us were transported by Louisoix. That's why we all have survivor marks (that's what the tattoo is).
It's like how I was able to use Omnislash to beat Sephiroth at the end of FFVII, although gameplay-wise I never actually acquired Omnislash (don't judge me ).

Therefore, we should all have the slightly altered dialogue and the opening. It may be small, but if we are all Warriors of Light, we should all be treated so, so it must be a bug. That, and it was definitely accepted as a bug during beta. So there's no reason for people to keep trying to say that there were certain requirements.

I, for one, am a little sad that after all the time we spent together, Minfilia treated me like a stranger. I'd heard that there was some dialogue that mentioned that some people knew you, but have to pretend they don't, but I'd assumed maybe it was super subtle and I'd just missed it when I went through the storyline in P3. Now I'm sad all over again... XD I play games for the story, so I'd rather have little things like this happen for me if they're supposed to...