A look at the Latin letter
A look at the Cyrillic letter
A look at the Diacritics
Cyrillic small letter „н“ (uni043D) in regular
According to Russian typographer Alexei Vanyashin Cyrillic small letter „п“ (uni043F) is generally narrower then Cyrillic small letter „н“ (uni043D).
Here are some examples with different typefaces from different font foundries.