not sure if this addresses your problem or not, but I should mention that the default unit of measure in Inkscape is the pixel at resolution 90 dpi. In a program like Illustrator it is quite likely that they are using points at a resolution of 72 dpi. The ratio of the two is 1.25.
Other than that, if that is not the issue, could you submit an svg file which illustrates the problem?
not sure if this addresses your problem or not, but I should mention that the default unit of measure in Inkscape is the pixel at resolution 90 dpi. In a program like Illustrator it is quite likely that they are using points at a resolution of 72 dpi. The ratio of the two is 1.25.
Other than that, if that is not the issue, could you submit an svg file which illustrates the problem?