hey guys i got a question ... i bought a new 720 about a month ago and so i was able to update to the lates 8.15 north america map for free... and well i just got a used 930 and it only came with 8.00 map can i use the 8.15 map that i received for my 720 to update my 930 or do i have to buy a new map for the it ???? thanks