While I would love to add these to my beleaguered Russian Napoleonic army as reinforcements in the current campaign I am engaged in, they will need to wait for later games, but do form the basis of Baggovout's Corps at Borodino. While the Russian infantry uniform had possibly only the shoulder strap color as the only major difference between regiments, the flag design is the main feature denote his formation's regiments (for those regiments of mine which are lucky enough to gain a flag if I have one available!). Each of these stands represent a brigade and are represented by one of the regiments within that formation.
The French of the Russian Campaign also gain reinforcements in the form of the red-coated Swiss of Oudinot's Corps, which, while it did not fight at Borodino, I did as I love the color red and they have been on the bucket list to paint. The Perry pamphlet enclosed in their earlier war uniform plastics box is an excellent reference source. Each of the Swiss regiments had a slight difference in dress, not only in the facing color but of the different plumes and distinctions of their voltigeurs and grenadiers to make painting interesting (and longer). The pamphlet also has information on many of the other nations and French formations wearing the open lapel tunic including the Italians, white-coated French regiments, the Paris Guard in Spain among others as well as flags for many regiments. Even if you don't do plastics, ask for the sheets from a friend who does!