caesar had control over a very different territory than tarquin, very different styles of art, and a very different government and military than tarquin, and although he spoke tarquin's language, his subjects mostly didn't speak sabine and etruscan like tarquin's subjects did. i think you can make a case that basileios's government was a lot more similar to caesar's than caesar's was to gaius marcius rutilus's; certainly the justification caesar's assassins gave for killing him was that his government was uniquely un-roman

so sure, ship of theseus, but that didn't start with caesar. caesar was already five centuries of radical changes past tarquin (who also barely had a foothold in italy) and seven centuries after the mythological romulus