all one

Equally acceptable either way

All one means making no difference or being of no consequence.

If two options are all one to you, you have no preference between them: It's all one to me whether we eat Italian or Chinese.

The phrase suggests equivalence—that distinctions don't matter in the particular case.

identical

clone

Genetically identical organism

twin · mirror image · spitting image · double · lookalike · doppelganger · counterpart · facsimile · copy · match

unified

united

Joined as one

solidarity · collective · undivided · unanimous · synchronized · congruent · coherent · accord · consensus · together

merged

fused

Joined by melting together

integrated · melded · coalesced · synthesized · consolidated · combined · mingled · intermixed · homogenized · composite

Opposites
indifference vs. preference

all onecrucial

Of supreme importance

makes a difference · vital · important · significant · critical

sameness vs. difference

all onedifferent

Not the same

not the same · distinct · dissimilar · unlike · varied

Family

one, all, alone, oneness, all-out

Familiarity
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Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G