This grey uniform the new figures are wearing is called a round jacket and it was the fatigue dress for troops North of the Mason-Dixon line pre war and the stop gap uniform to cloth the large expansion of the army at the out break of war. These figures could represent almost any regular army unit post 1813, and up to 1821 when the regulations changed. As a result these figures, sans colours, could be useful fighting against any number of units including the 41st, 49th, Royal Newfoundland Regiment, 10th Royal Vetern's Battalion, and a long list of others beyond the ones you mentioned.
I might mention that whitened buff crossbelts were only availible to a few of the low numbered regiments and by war time black harness leather was the norm according to current research.
All the best, Ken Osen