English idiom similar to "grab one, hit the other"

Tarred with the same brush would be the first choice.

Fig. sharing the same characteristic(s); having the same good or bad points as someone else.

Jack and his brother are tarred with the same brush. They're both crooks. The Smith children are tarred with the same brush. They're all lazy.

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You can also consider six of one, half a dozen of the other also. It does not have a negative meaning and it is usually used when you think that neither of two choices or people is better than the other.

1. (idiomatic) The two alternatives are equivalent or indifferent; it doesn't matter which one we choose.
2. (idiomatic, of two people) Equally involved; equally responsible

^{http://en.wiktionary.org/wiki/six_of_one,_half_a_dozen_of_the_other}