Definition of "all one"

But what care I? I care not an she were a black-a-moor; 'tis all one to me.

c. 1602, William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act I, scene i]

Near or distant, blood or water, it's all one.

1843, Charles Dickens, chapter 3, in Martin Chuzzlewit

And sometimes he had some preliminary information to help him, and sometimes he had not. And it was all one, really. It was about as useful as information trying to convey the locality and intentions of a cloud.

1917, Joseph Conrad, The Tale