These are the only men with a surname starting with 'K' found on the roster of the 8th Louisiana Heavy Artillery

James Keegan, Co. A

C A Kelly, Co. 2 Paroled at Vicksbur

John Kelly, Co. D

John Kelly, Co. I Paroled at Vicksburg

Alexander Kerr, Co. D Paroled at Vicksburg

Hy Klophan, Co. D

Isaac F Kerr, Co. 3 Paroled at Vicksburg

Could you be referring to

Henry Carthy, Private "C" Co. LA 8th Battn Heavy Artillery
Henry Craps, Private "2" Co. LA 8th Battn Heavy Artillery