like (two) peas in a pod
Said of two people who are very similar in interests, actions, or appearance. Betty and Jennifer are like two peas in a pod, so it's no wonder people sometimes mistake them for sisters.
like (two) peas in a pod
Cliché very close or intimate. (Compare this with as alike as (two) peas in a pod.) Yes, they're close. Like two peas in a pod. They're always together. Like peas in a pod.
like peas (or like as two peas) in a pod
so similar as to be indistinguishable or nearly so.