I just bought a used mid-2012 MacBook Air to replace the early-2014 model my dog killed but the battery life is terrible comparatively.
Can I take the battery out of the 2014 and use it in the 2012 safely?
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Yes. According to iFixit, all 2010 through 2017 MacBook Air's use the same battery:
That's assuming we are talking about the 13". If you are talking about an 11", that changes things.
The short answer is YES
Apple is going to use different part numbers but essentially they are the same battery.
The easiest way to see if the batteries are interchangeable is to take a look at the aftermarket battery replacement. For example, this particular battery made by GreenBox Innovations and found on Amazon fits Macbook Air Models from Late 2010 through Early 2014