In general I thought that religiously restrictive dietary practices tended to largely overlap or be nested inside on another. More specifically, without getting into drawing pictures, Jewish and Muslim dietary restrictions are similar-ish in a lot of ways and so overlap a bunch. It’s possible to follow both, although you’d get some weirdness in doubling-up on incantations during slaughterings. Each also allows or proscribes things the other does not, so it would also be possible to follow one but not the other. In the midst of the overlap is vegetarianism (as in Hinduism) and within that the Xtreme Jain version of vegetarianism (no root vegetables, kills too many bacteria, etc.).

With that general tendency towards concordance in mind, I was surprised to learn that Sikhism (and the consensus among meat eating Hindus) explicitly prohibits eating ritually slaughtered animals, the only kind allowed in Judaism and Islam! They have jhatka meat (as opposed to kosher or halal) which is

Meat from an animal which has been killed by a single strike of a sword or axe to sever the head, as opposed to Jewish slaughter or Islamic slaughter in which the animal is killed by ritually slicing the throat. It has been described as the antithesis of ritual slaughter. [Wikipedia]

Basically the reason is that the Abrahamic fetishization of the killing process is creepy, which is a reasonable position.

But also, Sikh temples only serve vegetarian food precisely because everyone is allowed to eat it (as per said general concordance) and it would be mean to do otherwise (also very reasonable).

In conclusion, for the World’s 5th largest religion I sure don’t know much about Sikhism!