Very good question. As to uniforms, yes they would be very similar from nation to nation but for the color. Same as with most infantry uniforms. Details however will be tricky to ascertain (same as with many infantry uniforms viz. the shade of yellow of the coats worn by the Danish guards or their lace decoration). Artillery train drivers would mostly be hired civilians. French gun barrels used to be highly decorated. As to the guns carriages or their color, no idea, guess we'll have to check some contemporary paintings.