That info matches some of what I have. Did it come from Brooke's? I guess it was common for data to be listed different ways in different sources, mistakes were made, a soldier could be misinformed, he could be moved to another Rgt. Also, I have had trouble reading some of the old handwriting. Bennett thought he was in the 39th at the end. See below:
______________________________
A camp letter from Bennett Estes to his wife. All spelling is (sic):

My Dearest Wife
I Turn my Eyes to ward home and with a sigh I think of thee and with A hope I shall you see I think of thee my Dearest wife whoe are the pleshers of my life.

My Dearest children I think of you and hope I will soon be with you to hear you sing and se you play as I hav dun in A past Day.

My Jesus now I think of thee who both died to get me free from satons pour of wickedness I hope to prase thee with the lite.

Dear wife chek your letters after this form for the number of our Regiment is changed to the 39.

Mr. B.O. Estes
Savannah Georgia Box 800
in care of Capt Edmondson
39th Regiment, GA, Voluntiery