be all one to

it's all (the) one to me

It makes no difference to me one way or another; it's not important to me what happens. I don't really care what movie we see, it's all one to me. I'm not really a big sports fan, so it's all the one to me whether our team wins or loses.
See also: all, one
Farlex Dictionary of Idioms.

be all one to

make no difference to someone.
See also: all, one
Farlex Partner Idioms Dictionary
See also:
  • it's all (the) one to me
  • it's all the same to me
  • be up to (one)
  • be up to somebody
  • hone in
  • fashion victim
  • (it's) not half bad
  • not half bad
  • for all it's worth
  • for whatever it's worth