indistinguishable
adjective
UK: /ˌɪndɪˈstɪŋɡwɪʃəbəl/
US: /ˌɪndɪˈstɪŋɡwɪʃəbəl/
Impossible to see or recognize any difference between two or more things.
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The twins are almost indistinguishable.
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At that distance, the two ships were indistinguishable from each other, appearing as a single dot on the horizon.
So similar that you cannot know which one is referred to without extra information.
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The two sounds were indistinguishable to me.
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The artist's early works are almost indistinguishable in style and technique from those of his mentor.