Bought the Italeri 'French Infantry 1798-1805' set to use as Dorroseani militia: it contains six grenadier figs and they fit well to the Zvezda Old Guard grenadiers, of which set I've got a bunch of spares. Painted eight along with the Italeri ones so here's a complete battalion.
Still experiencing with the bases.
Zvezda to the left, Italeri to the right. There's some difference at the knapsacks as they're separate on the Zvezda figs. I have another regiment of Airfix's Old Guard figs but there's a noticeable size difference (forgot to include one of those on the pic).