Hi,
My hypothesis 's they are linked by their Austro-Indonesian root, especially between (Aboribinese)Taiwan and Philippine people.
I 'm currently in Taiwan. And I had mannaged to meet an aboriginese knife smith on eastern part of the island.
http://gsh.taiwanschoolnet.org/gsh20...sh/craft02.htm
In his shop, many knives are "real" enough. Although wooden parts and decoration are some distance away from custom/genuine quality but the blades are well heat treated and the tangs are secured with pins. His situation 's very much similar to those in Thailand, where many tradition knife making bussiness 's on their transformation from "knife/tool smith" to "souvineir manufacturer".
By the way, I have got 3 samples from him. They are souvineir/tool quality at reasonable prices.