Metric and customary measurements are similar in the way that they both are used to measure things. They differ though, in the scale they use and the way that they measure.
The metric system uses newtons for basic force unit and kg for the basic mass unit. The U. S. Customary System uses the lb for the basic force unit and slugs for the basic mass unit.
They are systems designed to measure characteristics - mostly physical.
peanut butter in tacos
Metric.
It is a customary unit.
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It's both.
In many European countries the metric system IS the customary system!
It is a customary unit.
The opposing systems are imperial and metric, not customary. But, meters are metric.
The pound is NOT a metric unit.
It is customary.
It can be more or less. An once (customary) is bigger than a gram (metric) but a pound (customary) is smaller than a kilogram (metric).
Metric.
Metric
Metric.
A "gran" is a German measurement, it is neither customary or metric. A "gram" is a metric unit.
customary
It is a customary unit.
I'm guessing by customary, you mean imperial. if so inches are customary/imperial