Yes to that and the fact that 37x0 firmware was not as well-developed and basically stalled when Garmin brought out the 34x0 series. They are the same hardware, Garmin dropped 37x0 development when they moved to the 34x0 firmware which is more sophisticated and stable.

34x0 use NTU EU exclusively, there aren't complete ancillary files for that series to go with NT mapping for Europe. Maybe just convert it and see what you think. My first 3790 was converted to 3490 and back many times without problems.