This gallery shows wargaming figures from various manufacturers in scales 20mm to 25mm including 1/72. The relevant manufacturer is shown in brackets.
Most are based 40mm square to work for rules such as Field of Battle, There are your Guns, Fire & Fury, Neil Thomas (various) and others.
For the dominant larger 28mm scale you can work out from these images which figures to borrow and cannibalize to make your 1848 Danish Army.
The Wargaming Erratic 