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Not the same. Depends mileage and condition. For a Miata, if it has a history of potential neglect. For one that I would want to hold onto for awhile I would do a compression, and if anything came back abnormal. I would do a leak down.
Compression test is just as it sounds. Hook up a pressure gauge to the spark plug hole, and crank it over. Highest reading is the compression for said cylinder. All cylinders within 10% is normal. basically looking for all cylinders to be in the same range with no outlier. Basically checks things like Head gasket, burnt valves, condition of the rings.
Leak down is a little different. You add compressed air into the cylinder and measure how much leaks out. You can also get an idea of what's wrong with an engine through the leak down. Ie. bubbles in the coolant, or hissing coming from intake/exhaust.
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