Officially with the Bardin 1812 Regulatins. In actuality a few years before-officially, but probably not practically.
And the colpacks worn by line horse artillery would usually only apply to officers and trumpeters, and that included the artillery train.
The following is not an all-inclusive list, but it should get you started.
Polish horse artillery, at least officer and trumpeters, wore colpacks.
The Nassau Light Cavalry Regiment wore colpacks.
The 1st Light Infantry Battalion of Westphalia wore visored bearskins. The sapeurs of the 2d Line Infantry Regiment of Westphalia wore visored bearskins. The 1st Westphalian Hussar Regiment wore the colpack. The officers of the Westphalian train troops might have worn the colpack.
Hussar officers of the Kingdom of Italy might have worn the colpack. The elite company of the 2d Chasseurs a Cheval wore the colpack, trumpeters wearing a white one. The entire 3d Regiment of Chasseurs a Cheval wore the colpack. The Royal Guard horse artillery wore the colpack and their uniform was modeled on the French Guard horse artillery. The Elite Gendarmerie of the Royal Guard wore the visored bearskin; however, this was a mounted unit and had no foot gendarmes.
The Neapolitan 1st Light Cavalry Regiment's elite company wore the colpack, as did the 4th regiment of that arm. The Trumpet Major of the Light Cavalry Regiment of the Neapolitan Royal Guard wore a white colpack. The Royal Guard Hussar Regiment wore the colpack, trumpeters a white one. The Royal Guard horse artillery regiment wore colpacks. The Royal Guard gendarmerie wore visored bearskins, but they were all mounted.
The Dutch Royal Guard Hussar Regiment, which would eventually become the Red Lancers (after 1810), wore the colpack.
For the Duchy of Warsaw:
Poniatowski's Guides wore the colpack. The 4th Chasseurs a Cheval's elite company wore colpacks with white for trumpeters. The 5th Chasseurs a Cheval elite company wore colpacks. The 10th Hussar Regiment wore colpacks.