To add to the confusion, here are more entries:

From Confederate Soldiers Buried at Vicksburg, Carolyn Reeves Ericson & Frances Terry Ingmire, 1981, taken from the UDC Record Book

Brung, Jiam Poine, Co. C, 1st La. Art.
Bourg, Jan., Co. W, 26th La.
Bourg, Valery, Co. C, 1st La. Art.

From Confederate Roll of Honor, Known Confederate Dead, Vicksburg Campaign, Gary W. Webster, 1998

Boung, Valery, Co. C, 1st La. Heavy Artillery
Bourg, Jas., Co. H, 28th La.
Brung, Jian Prine, Co. C, 1st La. Heavy Artillery