As I said "most" are round tangs, and even the example of a square tang that you show is not like the hollowed spearhead - it is rounded at top of the tang. Now most of then other Philippine spearheads that are square at the base are from Lumad groups (ie. Bagobo).
Also yours in question is not just narrower than Moro spearheads, but also (so far) Moro spearheads are not hollow ground.
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