Differencies(?) between Gayo or Aceh Rencong ?

[VVV]

I found out later that the one Erik asked about was Gayo.
Otherwise I still haven't found any 100% sure way to separate them.
Yours is a bit difficult too as it doesn't look as old as the ones in the reference works.
But the sheath might be Gayo? The ivory hilt however looks more like a "modern"
interpretation to me, but I might be wrong?

Michael