I found it very satisfying that your calculated inductance matched the results from your VNA. So many times unseen factors cause our observed results to differ widely from our expectations. So we should take a moment to appreciate those times when the universe lines up in our favour because they are few and far between.
I do the same thing, use VNA for such measurements if I can! it works brilliantly compared to LCR meter, if the measurement can be within (say) a few orders of magnitude of 50 ohms, whereas LCR meter works great elsewhere too, albeit at the limited point frequencies that supports. There are techniques to extend VNA measurement accuracy range, but they are not trivial, and some may require the VNA to support it too.
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