CT w and wo measurement question

Good morning,
Quick question regarding CT w and wo … measuring distance between TP of C1 and styloid. I get different measurements… am making an assumption that measuring bone on the wo image would be more accurate. Any guidance would be appreciated.

CT without contrast

CT w contrast

@Leah This area around C1 in the body is very flexible in multiple directions. Most plausible explanation is that the first non-contrast set of images was taken, then you slightly moved your head/neck, and the second set of images with contrast was taken with the head/neck at slightly different angle.
Also it might be just a measurement of two different places, e.g. one slightly below, the other slightly above .

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Thank you )).