There's at least one very big difference: the equipment for reactivating the frozen tissue, which modern cryonics does not even attempt to create, needs to be

There's at least one very big difference: the equipment for reactivating the frozen tissue, which modern cryonics does not even attempt to create, needs to be put on the spaceship at launch. Otherwise, even if perfectly preserved tissue arrives at its destination in a few centuries, it will just remain in that state until power runs down or something breaks.