`change_binary_epoch` in `TimingModel.compare()` #3702

Job	Run time
ubuntu-latest, ephemeris_connection	2m 17s
ubuntu-latest, black	22s
ubuntu-latest, py312-test-cov	1h 34m 31s
ubuntu-latest, notebooks	6m 18s
macos-latest, py312-test	1h 34m 25s
ubuntu-latest, oldestdeps	35m 40s
	3h 53m 33s

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