Yes, some hairs could have shorter terminal than others. Why not?
After all, our bodies are covered with hairs of very different terminal lengths (eyebrows different from armpits, different from legs, different from scalp, etc and within each of those specific sections hairs don't all get to grow to equal lengths either... - I'm sure it's primarily driven by genes).
ETA:
And yes, texture and diameter of individual hairs, too. They do vary, sometimes quite a lot. I have pretty multi-textured hair, personally, and I think lots of other people do, too. It's pretty normal for organic matter like hair.
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