Seems to be the same soldier to me:

Seaborn Andrews
Death: Dec. 7, 1862 ** Dec. 8, City Hospital
Vicksburg
Warren County
Mississippi, USA
Died in the City Hospital.
Co. E, 1st Louisana Heavy Artillary
Find A Grave Memorial# 117763819

……..

S Andrews
Death: Dec. 7, 1862 ** City Hospital
CO E 7TH LA
Find A Grave Memorial# 9709358

** Webster’s Confederate Roll of Honor

…….

S Andrews
Birth: unknown
Death: Dec. 8, 1862
CO E 1 Battalion LA
Find A Grave Memorial# 9709352

………

Seaborn Andrews

Enlisted on 9/5/1862 at Quachita, LA as a Private.
On 9/5/1862 he mustered as a substitute into "E" Co. LA 1st Heavy Artillery
He died of disease on 12/7/1862 at Vicksburg, MS
(Substitute for R. D. White)
Buried: Cedar Hill Cemetery, Vicksburg, MS

Sources used by Historical Data Systems, Inc.:
- Index to Compiled Confederate Military Service Records
- Record of Louisiana Confederate Soldiers
- Mississippi Confederate Grave Registry