File sharing in firen, freeze and firzen

[Tobruk]

Hi there.

You probably know that Little Fighter shares Firen's & Freeze's files for a Firzen to save space. But I want to stop the sharing. I modified Freeze's ice column and the Firen's explosion, but I want to Firzen retained the original explosion, and the column. How do I?
I tried to do the / sprite / original / col.bmp & exp.bmp but I do not know what file to relate to.

Thanks in advance.