Maybe they looked alike?
No, seriously. I dont think from what i've seen that the DB takes into account the cases of multiple leaders with same names.
Prolly cuz in ACW with so many generals with the same surname, u use initials to make them apart.
Napoleon era non French divisonal/corps generals seems lesser known(for some reason

) so there arent the same "awareness" that even if named the same they might actually be different ppl. Like the Essen's and Hessen-Homburgs.
Btw DB stat wise. At leased the Hessen-Homburg leading the Austrian corps is different than the Hessen-Homburg leading the prussian bde(Bülows corps), so some where in the DB some difference is made. Should be a Divisional aka 1 star austrian general too apart from the corps commander.
Kind regards,
Rasmus