Well, examples are different because I use actual numbers and files rather than descriptions of what goes there. In any case, if you have 1.2, then that operation is built in as codes that you can write in directly to a script call:
# remove_graphic_from_actor (actor_id, index)
# remove_graphic_from_actor (actor_id, graphic_name, graphic_index, graphic_hue)
# add_graphic_to_actor (actor_id, graphic_name, graphic_index, graphic_hue, index)
There are more details in the Instructions of the script, and an event in the demo does it so you can take a look at that.
And index is the index of the character in the character set. Note that there are eight in character sheets, index identifies which of those characters is to be used. It goes:
0 1 2 3
4 5 6 7