decoration on sumatra/aceh/atjeh ladieng + cojang

[asomotif]

I recently bought a cojang / Co-jang with a decoration on the back that is 'almost' identical to a Ladieng that was already in my collection.

Is this a big coincidence or is it a rather common decoration ?
I would like to see some more aceh/sumatra weapons with these decorations but most books only show small pictures and no details.

any help from forumites