Is spot metering just an EV compensation?

Metering, regardless of type, and exposure compensation are different functions with different purposes. Metering is used to obtain exposure exposure settings (ISO, aperture, shutter speed), while exposure compensation is used to modify those values. It is basically the difference between nouns and adjectives.

There are typically several metering methods to choose from:

• Average – The entire scene is averaged and compared with some reference (usually middle gray).
• Center weighted – The scene is averaged with emphasis on the center of the frame. (It is given more "weight".) The result is compared with the reference.
• Spot – A small portion of the frame ("spot") is compared with the reference. It usually covers about 1-2% of the frame. In some cameras, it is always the center point. For others, it follows the focus point.
• Evaluative / Matrix / Multi / Etc – These are proprietary methods that vary by make and model. A commonly described method in this group divides the frame into several parts that are evaluated separately. The pattern can be compared with entries in a database to find an appropriate exposure setting.

Exposure compensation takes results from any of the above metering methods and adjusts it to increase (+) or decrease (-) exposure. The amount of compensation to use depends on the desired result and photographers' judgment.

If I spot meter...can I achieve identical results with EV compensation?

While it is possible to obtain the same settings from any of the metering methods by applying an appropriate adjustment, exposure compensation would be determined on a scene-by-scene basis by comparing the settings produced by different exposure modes. There is no single EC setting that will transform results from one metering mode into that of another.

So a photographer that is good with EV adjustments technically wouldn't need spot metering?

Spot metering isn't needed, though some may like to use it. A few cameras have only a single metering mode. On such cameras, exposure compensation is the only way to control exposure.