Minimal Voting Data of 2020 and 2024 US presidential election.
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Shouldn't they have changed by the same amount?
No. Why would they? Even if everyone voted (which isn't even remotely close to being true) populations also change.
Populations change from birth, death, emigration and immigration. I highly doubt more democrats than republicans died/emigrated/abstained. It is much more likely that this skewed data is due to something else