Ask what was weighed
A single shoe, a pair and a boxed shipment are different measurements. The exact size, sex-specific version, insole and moisture state can all matter.
Separate the sources
Mark manufacturer figures as manufacturer figures. If you weigh a shoe yourself, record the scale, unit and size, and photograph the reading if useful.
Avoid false precision
Converting ounces into grams can produce unnecessary decimal places. Preserve the original measurement and round appropriately for the precision of the source.
Do not turn weight into a verdict
Weight is one attribute. Fit, intended surface and how a shoe behaves for your runs still need their own evidence.