Reznor Fireball Help

Hey guys!(Hope this in the right place ) I'm new to SMW Central and this is pretty much my 1st post EVER on the internet....but does anyone know how to change Reznor's fireball on a per level bases? I know if you change the address at 012378 from AD 9B 0D to AD 80 80 the fireballs will be the Reznor's OAM tiles but it also affects the small fireballs used by every enemy. Is there any way to have this done ONLY on a per level bases? I've searched through the forums but couldn't find any question similar to mine . Any help appreciated, thanks guys!

Thank you so much Ladida! I'll try this as soon as I get home, and I'll give level.asm i try too, thank you so much!

Before this thread can be closed, does anyone know the addresses for Reznor's Fireball hit range, because it's range is still the small fireball's radius hit, I wanna change to have the big fireball radius, thanks guys!

I forgot to tell you that changes the battle mode to Iggy/Larry's (which is also Reznor's) so the level glitches terribly and kills mario (either way your patch worked successfully!), but is there a way to give the Fireballs their 16x16 hit radius instead of 8x8?

EDIT: Reznor uses battle mode #$C0.