I was asked to visit a different client last night, other than my usual one. I said 'Yes, sure. It's six and half-a-dozen.' (In the nature of my work, I can choose what I do; it was a request not a demand.)
I meant that, to me, there was nothing to choose in terms of travel distance or client requirements, so I was happy to accept either assignment.
But could I have said 'it's six and half a dozen' in one word ?
'Yes, sure. It's _ _ _ _ _ '
Consider: It's all good.
A phrase used to express general approval, unconcern, or disinterest.
- Steve: "I'm so sorry, John, but I scratched your car when I was parking."
John: "It's all good, Steve. Don't worry about it."- A: "Is lasagna all right for dinner?"
B: "Yeah, it's all good."
Without knowing exactly what you were trying to convey, it's difficult to come up with an idiomatic expression with the right nuance.
There is the expression "six of one and half-a-dozen of the other", but it's not used in the situation you describe. I've encountered it when describing points of view which are equally valid, or two sides of an argument; or when you are making an active choice between two alternatives. It's not generally used when the (potential) choice has already been made for you.
If you were really saying that as far as you were concerned there was no difference in what you were asked to do — same travel, similar work, whatever — then all the same might be more appropriate: "It's all the same to me." This does have a slightly dismissive air and could easily be accompanied with a shrug.
be all the same to
Be unimportant to (someone) what happens.
‘it was all the same to me where it was being sold’
When there's nothing to choose between one option or the other; neither is significantly better or worse than the other, you can say "Yes, sure. It's immaterial".
immaterial
adjective
unimportant under the circumstances; irrelevant.
"the difference in our ages is immaterial"synonyms: irrelevant, unimportant, inconsequential, insignificant, of no matter/moment, of little account, beside the point, not to the point, neither here nor there, inapposite, not pertinent, not germane;
I am not sure that there is a word for quite what you describe here, but taking the phrase of 'six of one. half a dozen of the other', you could use the word indistinguishable
In terms of your two clients, I doubt that you could describe them as indistinguishable, but in terms of requirements they may be described so.
To the untrained eye, they are indistinguishable one from the other.
You could also describe them as comparable, which might be a better fit.
The planet Pluto is comparable in size to our Moon
