Gee, should someone come out and lace them up for you?

You made a measurement, At some point you have to trust your own skill set and make a command decision.

Check your work, check the data entered and go with it.

As for the discrepancy between your measurements and the specs, a few possibilities include; a generational difference in the rim profile, an older spec referencing the nipple seat diameter instead of the (nipple slot) ERD, or even a plain old typo.

Consider what's the WORST that could happen. You'll have to buy new spokes for one or even both flanges, and will have wasted the labor of lacing. So, less than 1 hour plus $20.00 or so, which isn't too high a price to pay for the education.