There are indeed BIG differences from 1848 to post-1850 uniforms (shakot, buttons, collar, overcoat, equipments...) but of course they're reduced to 1/72, so it's nothing you can't live with!
But then... it's better to use other existing similar plastic figures!!
thanks for the lost link. I like Ugo's figures, nice small dioramas there.
You are right with buttons, colars etc. And as you say in 1/72 you won't see much difference.
This brings me to the question "How important is historical accuracy"? On the HAT-forum people are talking about the good Waterloo 1815 Polish infantry. In reality they are full of mistakes and in terrible poses. How much does this matter to a wargamer or collector?