Original New Leaf cartridges and downloads get lumped together in the log. The newer Welcome Amiibo cartridges get lumped into their own file. So I have both types of cartridges - updated originals and new WA - plus an original download which got updated to WA, and Activity Log reads them 1) as New Leaf in one file and Welcome Amiibo in another file and 2) all data for each of my WA cartridges is lumped together and all data for each of my original cartridges is lumped together. I have not noticed any problems with game progression at all. I get badges and stuff in time.