Natalee's hair was bleached, or frosted in various shades, so yes, there could be a difference in shading.
And the difference in length could be that the two strands didn't break off from the shaft. OR, since hair grows uneven, that could account for it.
But TexKat, my cynical nature tells me that the only way the duct tape could contain Nat's hair, is if it were PLANTED there..JMHO.
I suspect it's a practical joke.
See you when I get home.