Hmmm... he should stand out. The difference is still pretty significant even if you ignore the age.
And, of course, Finnish hockey and NA hockey does have its differences. In NA PeeWee, it sure is much more coast-to-coast than in Finland and I guess that's why skating doesn't get stressed as much. While the level is, certainly, below Canadian PeeWee leagues and whatnot, it still is very difficult to lead the league in PPG as a defenseman, let alone as a double underager. That sort of a thing does generally not happen for double underagers - As an example, Jesse Puljujärvi is perhaps the most dominant junior player Finland's had in recent years, and he as a double underager in the u16 league scored only 34 points in 23 games, which is nowhere the league's top scoring.
Now, the u13 level isn't nearly the same as the u16 level, but it's in my opinion even more difficult to dominate at u13 level as a double underager than at the u16 level. Two years is so much larger a portion of one's age at that point. Of course, we're going to have to wait and see for him to play some more in order for us to get better comparisons(Puljujärvi only started to play in a significant league at the age of 13).
I believe Patrik Laine was playing in C2 juniors at the age of u14, which would only be 1 year underage. 2 year underagers doing so well are really difficult for me to even think of. And D1/D2 scoring hasn't really been available for very long time so it's even more difficult to compare.
And of course, it needs to be kept in mind that he's a defenseman. The #2 D in PPG in the group stages was, well... at 10 points in 10 games. Aron Kiviharju had 47 in 14 games. And for the league itself, #2 defenseman in the division in PPG was at 13 points in 9 games. Very few actually had a PPG as a defenseman. Aron Kiviharju was at 36 points in 9 games.