Goodhart describes the value of a measure, while Campbell highlights the social pressure and corruption caused by one.

Goodhart’s law:

When a measure becomes a target, it ceases to be a good measure.

Campbell’s law:

The more any quantitative social indicator is used for social decision-making, the more subject it will be to corruption pressures and the more apt it will be to distort and corrupt the social processes it is intended to monitor.

I often hear Goodhart’s law discussed in a tech industry context, but quoting Cat Hicks: “I think most of the time we mean Campbell’s law”.