No you cant join a previous pack with the new autoguia, you'd have 2 autoguias in the pack and this is not possible, but you can split by FID, rejoin the Brazil CN, tracksource one and the new autoguia.
Actually new devices support any name map, no more need to join maps, easier to add the new one in your sd-More confortable to download, to add in gps and update it-
In sd is safer-