Mixed pair of Malay knives for comments

[Captain]

Hello all, I've recently been gifted these two knives from a family with connections to Malaysia. The ancestor was in tea sometime at in the early 1900's. It is thought he brought them back to the UK.
It has been suggested that they are from Sumatra when I put them online, I would value any other thoughts or opinions, especially on age, use and origin.

Many thanks in advance.
Captain.