They may be an easy conversion from rifles if you want figures that look nothing like Cazadores! Look at the uniforms they are very different and I suggest that for anyone who likes a bit of accuracy then blobbing paint all over riflemen just doesn't do these troops justice.
As for line infantry then the Dutch/Belgium Militia are pretty much spot on for the Portuguese. I think the uniforms made in Britain for Portugal were also sent to the Dutch.
So I for one feel that the Cazadores need to be done properly.