PSA: If you want matchmaking that groups you based on Rank, you have to play Ranked

Normals has separate MMR from Ranked.

If it had the same MMR as Ranked then what would make it any different from your Ranked queue? It'd just be the same exact thing, doing nothing more than splitting the player pool between two identical queues; except one of them doesn't give you rewards.

With Dynamic Queue coming, even the difference of premade groups will go away.