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You'd use your ears and work out whether it works fine or not. If both kicks have a similar amp envelope and are around the same length, then it shouldn't be a problem - the sidechained sound will still get pushed down when it should be pushed down.
If the kicks are quite different, for example the kick you're using in your song has a much longer decay and you're sidechaining a bass to a kick with a short decay, the bass could come up a lot more quickly and clash with the audible kick.
But yes, use your ears - if it sounds fine, it's fine!
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