Ashkenazi jews and Sephardic jews have the same origin---Ditto.
and the same religion. They differ by the geography of
their wonderings which led to minor differences in WORD
pronunciation in hebrew-----and recipes acquired over the
Millennia. The question would be something like asking---
'are Irish catholics related to Italian catholics' ? <<< those
two groups are far less 'related' than are Ashkenazi jews and
Sephardic jews------btw---you left out MIZRAHI Jews. I am
not sure where to put Ethiopian Jews or the Jews of Southeast
ASIA. My own remote family background is mostly European----hubby likes DILL and calls it "that ashkenazi herb" In the town of my childhood (USA) the Irish catholics called the
Italian catholics "WOPS"----sometimes "greasers"