Allos and heteros ‘have a difference in meaning, which despite a tendency to be lost, is to be observed in numerous passages. Allos expresses a numerical difference and denotes “another of the same sort;” heteros expresses a qualitative difference and denotes “another of a different sort.” Christ promised to send “another Comforter” (allos, “another like himself,” not heteros), Jn 14:16. Paul says “I see a different (AV,”another”) law,” heteros, a law different from that of the spirit of life (not allos, “a law of the same sort”), Rom 7:23. After Joseph’s death “another king arose,” heteros, one of quite a different character, Acts 7:18. Paul speaks of “a different gospel (heteros), which is not another” (allos, another like the one he preached), Gal 1:6,7. See heteros (not allos) in Mt 11:3 Acts 27:1; in Lk 23:32 heteroi is used of the two malefactors crucified with Christ. The two words are only apparently interchanged in 1 Cor 1:16 1 Cor 6:1 1 Cor 12:8-10 1 Cor 14:17,19, e.g., the difference being present, though not so readily discernible.’ (Vine)