The size difference between the two files is confirmed. The bounding boxes for the two .svg files are given below. Illustrator - width="194.284px" height="75.238px" Inkscape - width="242.855" height="94.04725"

The ratio of the sizes is exactly 1.25 which equals 90/72, which equals the size ratio of a point to a pixel. It looks as though Inkscape has probably assumed that the original dimensions were given in points, and has probably converted them to pixels by multiplying by 90/72, which is a reasonable thing to do. (However, I know nothing about Illustrator, so I don't know if the native units in Illustrator are points or not.)