Can wild rabbits eat pet rabbit food?

You can but it might not recognize the unfamiliar food so Its probably better to buy timothy or alfalfa hay and slowly introduce pellets.

Commercial rabbit food is made for pet rabbits, which are the European Rabbit species. Depending on where you live, the wild rabbits might be a different species and the food might not be especially healthy for them.

Wild rabbits shouldn't be raised as pets, unless they're being rescued by an experienced wild life rehabber. You shouldn't feed wild animals, because this will make them dependant on humans -- unless it is a matter of life and death, in which case you should contact an authority (like a wildlife rehabber, rabbit rescue organization, animal welfare organization, etc.).

Rabbits eat a diet of pellets, as well as hay and fresh, dark leafy greens. Pellets alone isn't a healthy diet for rabbits.

See the related questions and links below for more information.