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AWI Brits wore a tricorne and in the Irish rebellion a bicorne, the cut of the uniform is similar and some fencible units would look very similar. Personally I would use the correct figures and then also re-use them for Egupt or the battles in the Caribean.
In terms of one sided, well the French give the Irish side some much needed hitting power and it was initially a close run thing by all accounts. Clearly though un-trained pike armed Irish rebels don't stand up well in a formal battle situation to British Veterans when they come together. Many of the Crown forces though were Fencibles, Irish Militia. I personally think the war is better fought at a skirmish level where ambushes and so on can even things out.