Here are the two boxes on top of each other in the UI.
Here are the two SVG files,you can see the boxes are the same size in both (the outer box is 12.849 mm x 11.679 mm). File 2 was originally a DXF exported from fusion 360 and then “saved as” an SVG. However, I then copy/pasted the box from file 1 into file 2 and deleted what was in file 2 and glowforge is still sizing file 2 incorrectly.
File 1: https://drive.google.com/open?id=1Q2GFcph9aDyiX1rw_yLzPoISceKmaDIA&fbclid=IwAR3RUbmeKtAbgFgLo7rIgMMz-C2TUolFX1zBiEfluGfqk0RDkCCBrLesXMs
File 2: https://l.facebook.com/l.php?u=https%3A%2F%2Fdrive.google.com%2Fopen%3Fid%3D13G2Q8PNZ48Z3mcYTsX8tlU66qUAf753K%26fbclid%3DIwAR19VOy5wO_bbDQvTZxWYYdsIkzf2iVsFGzVxHYRu-hmW4RivnTLbgDWTh0&h=AT1PqCT9qytqTCYhI4RVhLHGttUy_xsymrvq6cLC1Hp6QtjpJOYU2S9ycaTJm4hLij4jGB-w0oHzdaeQYybEj4pCA9WkY3WMfRSHGwxaK0oNlmqRjv5Bu7L3GItm1YHthV9JYMEQEsCOnGxURJ3E
I don’t have illustrator - can someone confirm that the boxes show as the same size in illustrator? Perhaps that will help show if this is an inkscape issue or a Glowforge issue.