Unless you need to use Cyrillic or other Unicode-specific features (particularly for address searching), the NTU version of mapping will work fine in devices with firmware originally designed for NT. At some point Garmin issued a firmware update for 1xxx devices to make them more unicode compatible however Garmin won't supply NTU maps willingly, even for devices with NT LM because they consider them 'end of life'.
This is where you may have actual problems because MapSource uses a different algorithm to assemble IMG files from GMAP tiles and it might not play well with modern NT/NTU map data. Best to use MapInstall to avoid problems on the road such as spontaneous rebooting or freezing when navigating.Now the 1340 has very limited space of 4GB, using Mapsource I made a Portuguese and Spain gmapprom.img .....
I'm aware of all the arguments for continuing to use MS because of the better GUI and selection process and I actually much prefer it too over MI. However in practice, imho the lessor of the two evils is having to contend with MI's crappy interface. I recall someone did hack a MI version years ago to enable the window to be enlarged sufficiently to make it bearable, it was pietu i think before he was banned.
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