No, they are not the same data. Though, they would be of the same unit.
Measurement.measured_qty would be an actual measurement
Assembly.measured_qty should be something more like 'a quantity in the measured quantity's units'.
24 ft and 1.33 ft respectively in the original example.
BUT these were just placeholders for this question. There's a whole series of related tables where I would be looking to apply a naming convention for successive ratios like this. Hence the need for a consistent convention.
[edit]
It occurs to me I'm essentially modeling the 'railroad track method' for unit conversion.