Abib is the same month as Nisan, the first month. Like Tishri is the same month as Ethanim, the seventh month. It doesn't have anything to do with translations.
Nehemiah 2:1 (KJV)
[SUP]1 [/SUP]And it came to pass in the month Nisan, in the twentieth year of Artaxerxes the king, that wine was before him: and I took up the wine, and gave it unto the king. Now I had not been beforetime sad in his presence.
Esther 3:7 (KJV)
[SUP]7 [/SUP]In the first month, that is, the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month, that is, the month Adar.
Exodus 13:3-4 (KJV)
[SUP]3 [/SUP]And Moses said unto the people, Remember this day, in which ye came out from Egypt, out of the house of bondage; for by strength of hand the LORD brought you out from this place: there shall no leavened bread be eaten.
[SUP]4 [/SUP]This day came ye out in the month Abib.