Center engines on ship will be same as booster engines. This is basically Raptor 2.
— Elon Musk (@elonmusk) July 4, 2021
Raptor Vacuum would be only variant. Tbd as to whether to commonize R-Vac with Raptor 2 (more thrust), keep same or tighten throat (more Isp).
Adding 3 more R-Vac to ship with max Isp maybe …