Tell me if I'm understanding this correctly, will I be swapping out my Nautiluscoin for Nxt Coins, or will I be just using my Naut Coins on the Nxt System?

Nxt Coins have over 999,997,096 supply while Naut has a 5,322,099 supply.  Is coin swap going going to dilute the worth of my Naut Coins.

I would like to the know these details before proceed.