Proper overlap exists between eastern Anatolia and Iranian Azerbaijan in terms of phenotypes. Many of the settled Turkic populations in Iranian Azerbaijan were once natives of Eastern Anatolia. The boundary between Iran and Turkey was not ethnic but political due to war between Ottomans and Aq Qovanlu and later Saffavids.
Saying that, the difference exists as well in head shape, the Iranian Kurdish, and Azeri population has progressive features due to the baseline Corded component of Iranid phenotype. The longer face, dolichocephaly, hypsicrany etc. Turkish due to Anatolid, Armenid prevalence have different head shapes. If someone flies from Tabriz to Istanbul regularly they will start noticing the difference.
My half-decade thread here on Iranian Azeri phenotype
https://www.theapricity.com/forum/sh...Iranian-Azeris
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