Distinguishable :: Distinguishable (a.) Capable of being distinguished; separable; divisible; discernible; capable of recognition; as, a tree at a distance is distinguishable from a shrub..
Indistinguishable :: Indistinguishable (a.) Not distinguishable; not capable of being perceived, known, or discriminated as separate and distinct; hence, not capable of being perceived or known; as, in the distance the flagship was indisguishable; the two copies were indisguishable in form or color; the difference between them was indisguishable..