There are 11 attack sequences that are changed between FF4j and FF2us. I have the hex data if anyone is interested, but I think it just clutters up the explanation, so ask me if you want to see it. There are 4 normal sequence changes and 7 lunar sequence changes. Here they are:
Normal:
1. Sequence 71: This is the change documented by Deathlike2 in
this thread.
2. Sequence AA: The first instance of the Dark Elf says "ME ATTACK YOU!" (brilliant translation work, in my estimation) while performing his fire/lit/ice attack. In FF4j, this is executed with an F1 byte. In FF2us, it's executed with an F2 byte. Not sure what the difference is, but it's there.
3. Sequence E5: During the Asura battle, her Armor casting in FF4j is changed to a Cure4 casting in FF2us.
4. Sequence F1: During the Elements battle in FF4j, Valvalis performs an attack, casts Ray, attacks twice more, then casts Storm. In FF2us, she attacks, casts Ray, attacks, casts Ray, attacks, then casts Storm.
Lunar:
5. Sequence 30:
Ogopogo's reflex sequence Pale Dim's attack sequence in FF4j is to attack 5 times in a row and then cast Storm. In FF2us he just attacks 5 times.
6. Sequence 4C: Zeromus' sequence has four small changes. During this sequence, he resets his magic power four times. In FF4j, these values are 0x27, 0x27, 0x31, and 0x27. This is changed to 0x1F, 0x20, 0x24, and 0x20 in FF2us.
7. Sequence 4D: Similar to #6. In FF4j it uses the value of 0x15, in FF2us it's 0x0E.
8. Sequence 4E: Same sequence as #7.
9. Sequence 55: Similar to #6. Values of 0x27, 0x15, and 0x27 are changed to 0x1F, 0x0E, and 0x20.
10. Sequence 58: Similar to #6. Value of 0x28 is changed to 0x24.
11. Sequence 59: I'm pretty sure this isn't used. It's blank in FF4j, and in FF2us it's just 26 (which would cast Virus). The last value of sequence 58 is 26, so I'm pretty sure it's just a remnant from reducing the sequences at some point.
So, there you have it -- all the changes between FF4j and FF2us. I did this off the hex data, so I might have made some mistakes. If any of this isn't reflected in gameplay, let me know.