Hoshin Engi, Vol. 3, Ch. 20
The Princes’ Names
In the original, both princes have the same names but written differently, i.e. 殷郊 (Inko) the first prince, and 殷洪 (Inko) the second prince.
In the anime, the names were changed to Inchao and Inhon.
The names were changed in the English version because there’s no way to tell the two apart with the original names written in romaji.