indistinguishable

(s) exactly alike; incapable of being perceived as different
- rows of identical houses
- cars identical except for their license plates
- they wore indistinguishable hats
identical,
(a) not capable of being distinguished or differentiated
- the two specimens are actually different from each other but the differences are almost indistinguishable
- the twins were indistinguishable
- a colorless person quite indistinguishable from the colorless mass of humanity
undistinguishable,

identical undistinguishable

distinguishable