You may be right, but the census records show that George A. Pourciau was born in October 1890, not November. I also notice the baptism date you have in your records is April 1891. Coincidentally, Rose Major Aguillard, George's mother died in late March, 1891. It is highly possible the the Pourciau's took baby George at this time and had him baptized as their own. He was after all only about 6 months old.
And also curiously, the only person in the Pourciau household, including all the parents and children that is listed with a middle initial on the 1900 census record is George, and his middle initial also happens to be A.---for Aguillard. It seems mighty strange that he is the only person for whom a middle initial was listed.
I still think this is George Aguillard, as I can find no later evidence of a George Pourciau born in 1890. If you can prove me wrong, I'm certainly open to it, but for now I'm sticking to my guns.