gatopo and nctopo Maps

[gatoruss]

I was looking at JaVaWa GMTK (http://www.javawa.nl/gmtk_en.html) to manage my maps on my Garmin Oregon 450.

One feature of the program, apparently, is to identify potential issues with maps and the program indicates that the nctopo and gatopo maps have 3 map tiles in common.  Is this something that I need to worry about?