I haven't looked, but the LSU site numbers may represent only Alabama dead who can be accounted for by name. At the end of 1864 some Alabama units in Virginia produced cumulative company rolls which accounted for the status of every member. Charts produced from these rolls include totals for all those killed or mortally wounded, died of disease, died of natural causes, died in prison, murdered, executed or committed suicide. These are available for ten regiments which belonged to brigades led by Generals Law/Perry and Wilcox/Sanders. There's also a cumulative roll for the 5th Alabama Battalion.

I hesitate to use figures from the casualty reports, particularly those mentioned in the unit histories.