There is obviously a bit more brightness to the metallic figure, but on the whole, they do appear to be the roughly the same. Maybe the photo's have something to do with it, and to actually see both put togeather by eye would make a vast difference. As you have the figures, Do the metallics look vastly different from the oil ones?
There are those who feel happy to use metallics and those who think it is all wrong, personnally I think everyone should do what they prefer. No right, No wrong. I would judges figures on how well they were painted, not the medium used.
If you are going to make a point about using metallics, then you could say, should flats be painted in Acrylic???
I have the best of both worlds, I use Acrylic oil paint!!!!!

I am currently trying to paint the Brass coal scuttle on Tweedledee's head, using oil paint-- can I get the colour right? NO