`change_binary_epoch` in `TimingModel.compare()` #3685

Job	Run time
ubuntu-latest, ephemeris_connection	2m 51s
ubuntu-latest, black	20s
ubuntu-latest, py312-test-cov	1h 28m 38s
ubuntu-latest, notebooks	5m 45s
macos-latest, py312-test	43m 15s
ubuntu-latest, oldestdeps	35m 46s
	2h 56m 35s

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