If the special power of the active race pertains to regions occupied by the race you have in decline, are you allowed to collect coins for that?
For example, you control the Iron Dwarves which are in decline and occupy Mining regions. Your new Active race are Mining Drow.
Can you collect extra coins for the Mining regions that the Iron Dwarves occupy even though it's the Drow special power that allows you to collect extra coins for occupied mining regions?
What is the relationship between races that are Active and In Decline? Can your Active race occupy a region that's already occupied by a race you have in Decline?