First there's the question of how you are transferring from your recorder to your DAW. Are you transferring digitally via ADAT lightpipe or S/PDIF or something like that or are you transferring via analog lines?
If you're transferring analog, there could easily be a few dBs of mismatech between the D/A converter calibration on your Kirg and the A/D converter calibration on the DAW interface.
Your Korg may or may not have a maximum output specification (measured in dBu), and if it has one, the exact title of the spec can vary. But you need to look at that to determine just what what dBu voltage level 0dBFS equates to on the Korg, and therefore what dbFS reading a +4dBu line level voltage equates to. Then you'd need to look at the same thing on the A/D soundcard/interface on the DAW. It's possible, for example, that with everything at unity gain, what shows up as 0dBFS in your recorder may translate to clipping on your DAW, because the calibration on the converters is a few dB different.
If you can't find those specs to confirm the actual numbers, I'd simply bring the output gain down on the Korg until the peak reading on the meters meters on the DAW fairly well corrspond with the peak readings on the Korg. If the Korg oesn't give you output level control, then you'd have to adjust the input levels on your soundcard interface to acheive similar matching.
G.