Judging by appearances only, it will NEED the varmint configuration, as it's smaller than the 455, and lighter, which would make it harder to shoot well. Mechanically, it should be the same, but when you factor in the size of the action (which looks tiny), it will be more difficult to shoot well. Frankly, I have no idea if it will shoot, or not.
Preliminary results from some guy in Thailand seem to indicate that they shoot really well, but he had a Hubble telescope on his, and he was shooting some pricey Eley. I will not allow myself to get into that trap.