This message was buried away at the bottom of the order page on the Nintendo e-shop for the Collection of SaGa:
"This title has largely been replicated in its original form, but several changes have been made to meet evolving cultural and social norms."
The same message is displayed every time you start the game. In the original version, talk to Johnny in Giant's town, and he'll tell you how to get into Giant's town proper: "One of the stairs is colored differently. Use that to get in." But now, he'll say: "One of the stairs is pigmented differently. Use that to get in." So far, this is the only obvious example, but the word pigment sounded so wrong in that sentence that I went to check on my old game boy color (oh crap! I mean my old game boy pigment! Pigment, is what I meant!), and yes, it used to be 'colored'. There's a few other changes, like the starting weapon for robots is called a pistol instead of a colt, but that's not as jarringly bad as using the word pigmented instead of colored when describing an inanimate object that is a different color to the other inanimate objects around it.
I can only hope that nothing major has been changed. I'm also glad I still have the original carts of the first three games, just in case I'm
SPOILER WARNING!!!!!
no longer allowed to cut God's head off with a chainsaw, stop banana smugglers in feudal Japan, and beat up the ocean.
EDIT FOR FURTHER CHANGES: the terrorist enemy has been renamed 'partisan'.
The banana smuggling happens in world nine, Edo, based on the Japanese period of the same name. It's actually a case of original censorship - in the Japanese version, it was opium smuggling, but nintendo of America changed it to bananas. But that only made a quirky game even better, because the local detective, judges, shopkeepers and even the shogun are all going bananas over, well, bananas. There's even a guy wandering the streets in a daze asking for bananas because he's suffering withdrawal symptoms, and he even points out that there's no reason to ban bananas.
The final boss of saga 3 is Xigor, a godlike being who takes the form of the ocean, rendering him immortal, because as one of his lackeys points out, how do you defeat an entire ocean? You do anyway, of course, due to assistance from another god, but saga 3 isn't as good as the first two anyway.
Other changes so far include enemy names, specifically the terrorist enemy being renamed partisan.
SaGa 3 has more traditional mechanics and a fairly generic time travelling story. It's a more polished and balanced game than 1 and 2, but the appeal of 1 and 2 was just how bizarre it could get at times.
I've not tried the saw yet, I started with 2 as that's my favourite, but I'm hoping it's not been changed.
I'm on my mobile st the minute so can't get a screen shot of the terrorist enemy, but if you search for final fantasy legend terrorist I ages, there should be one. It's basically a guy crouching down, holding a gun, wearing a uniform with one of those peaked military caps.
You know, I never even noticed, after 30 years of playing, that it was spelt terorist! The character limit probably explains why the demonlord was called demoload. I was always confused as to why I was fighting against a demo loading up :p