What is the Functional Difference between Final Fantasy XII and The Zodiac Age?

when i played the original Final Fantasy XII (not International with the Zodiac Job System) i remembered that Guests could not be controlled or have their Gambits accessed. this went along side with what Balthier said when Amalia first joined

Think of her as a Guest. our "Guest" will do as she pleases won't be taking orders from anyone and will leave when she pleases it

And i do recall not being able to issue commands in battle to guests because i never came across their command window when issuing orders.

So this got me thinking, aside from having the Zodiac Job System are there any other functional differences between the original Final Fantasy XII and Final Fantasy XII: The Zodiac Age?

According to this site, the major differences are:

• Balanced game play

I even experienced this when I played it is that there are alot of baddies who will one-hit-kill you in the earliest stages. They made these areas alot easier for new players.

• Trial mode

Basically, it's a special game mode in the main menu. You fight 100 waves of baddies that get harder and harder with your party.

• High speed mode

It is simply a feature that speeds up gameplay.