if you are interested in pressing one key and a different key ends up in the clone, then you would use a keymap.

two to be exact. one for the main and another for the clone.

once you define the keymap, you load it onto the specific clone by right clicking on the clone entry in keyclone and selecting 'load keymap' on the popup menu. do that for both clones.

your first keymap would map a key (ie: 3) to a hotstring ( cast_fireball )
your second would map the hotstring ( cast_fireball ) to whatever key you want (ie: F1)

to define the keymaps, use the keymap editor in the setup dialog.

if you want more info, let me know (search the forums for keymap or hotstring for more)