Pony Fantasy VI Remake

Okay, was doing some C2 work and had a thought.

http://datacrystal.romhacking.net/wiki/F...sembly_C23

For an example, Pep Up. My hack gets rid of Pep Up because it sucks. But now I had the thought, if I take the code from C2/3CB8 for the Pep Up effect, and change it to something else, will it function properly provided I do the Hex right? For instance, I copy the Stone damage buff eff and change the damage modifier on it. Would it even have to necessarily be the same length as the current code, as long as it isn't longer?

Particularly, what I'm thinking is that I want to add some new way to calculate damage. I made Sabin's Bum Rush physical which is a big nerf, and in an update I want to maybe remove its defense ignoring properties, so I'm trying to think of ways to add some other damage modifier to it. If I copy the Valiant Knife formula and remove the defense ignoring part, will that work if I put it in place of Pep Up?

Code:

C2/3F89: A9 20        LDA #$20
C2/3F8B: 0C A2 11     TSB $11A2   (Sets attack to ignore defense)
C2/3F8E: C2 20        REP #$20
C2/3F90: 38           SEC
C2/3F91: B9 1C 3C     LDA $3C1C,Y (Max HP)
C2/3F94: F9 F4 3B     SBC $3BF4,Y (HP)
C2/3F97: 18           CLC
C2/3F98: 6D B0 11     ADC $11B0   (Add Max HP - Current HP to damage)
C2/3F9B: 8D B0 11     STA $11B0
C2/3F9E: 60           RTS

Also a general question, the full names of the cast used in the ending sequence, are those compressed graphics or text strings I could edit in Hex like the developer credits?