You may or may not be able to so tightly bound mak geo/culturally, and it largely depends on how you define "mak", as similar styles, including Arit, and ultimately parang ginah, Naga dao, pinagas, and panabas, spread out to both sides; tanged choppers.... This, however, with its backward s-curve (z-curve?
), seems like me pretty close to mak per se. The difference from the Montagnard ones seems to be in the absense of the nonsharp hook of (only) some of them (and I'm not sure that'd be on a fighting one; this machete-like parang-nabur-like rounded "Roman" slashing tip seems more practical for a weapon). As I say, a similar blade with a sharpened tip edge, though more pointily hooked, and often socketted, is often seen on mainland SE Asian farmers' tools, though I of course haven't had a lot of interest in what they call them, and so don't know....