Here is another good write up.
"According to Sikh scholar Khuswant Singh, "The Sikhs have a lot in common with [Orthodox] Jews. Sikh patriarchs look like [Sephardic] rabbis. Both the Jews and Sikhs have known persecution. Like the Jews, the Sikhs regard themselves as the chosen people." Like the Jews, the Sikhs lost their kingdom and have long struggled to re-establish an independent homeland, during which their people have been massacred in the hundreds of thousands. In their own diaspora they have created vibrant Sikh communities worldwide. Nonetheless, there are marked differences between Sikhs and Jews. Sikhs practice cremation and are strict vegetarians. Sikh men are not circumcised and fasting is outlawed.Amrik Singh Pannu was born in Amritsar, Punjab and resided in England before migrating to the San Francisco Bay Area in 1991. An initiated (Khalsa) Sikh and congregant of the El Sobrante Gurdwara, he has for many years served in the capacity of administrator of the religious school, as teacher of Punjabi and Sikh doctrine, and as the temple's librarian. Amrik has a BS in agricultural science and a post-graduate degree in rural economics from universities in India. A resident of Hercules, he is a volunteer at the Pinole Medical Center and at the Hercules Library."
Source:
https://www.paloaltojcc.org/events/sikhism-judaism-separated-at-birth