LightBurn assumes the new standard of 96 DPI.
You have a few options:
- Convert the 90 DPI files to 96 DPI prior to importing into LightBurn. I believe Inkscape may ask you how you want to convert if you load an older version file into a newer version. I’m not certain about this.
- Load the files directly into LightBurn. Then scale the whole design by 106.666%. This should correct for DPI change.
You can read about the DPI change here:
FAQ | Inkscape