Yes, all sound fine and essentially the same to me.
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Mister MicawberYes, all sound fine and essentially the same to me.Thanks, Mister.
Mister MicawberAsk for is just a verb phrase alternative to ask:Thanks, Mist
ASK 4. to solicit from; request of: Could I ask you a favor? Ask her for advice.
From among its many definitions, I suppose that for means with the object or purpose of or in order to obtain, gain, or acquire.