growth rate of primary & recurrence diagnoses

Can somebody shed some light for me?

Suppose you got originally diagnosed with primary breast cancer of which it indicated fast growth (aggressive type), then later in your recurrence diagnosis (mets from same breast cancer, not secondary), your tumors came back in other organs at a different growth rate, either slower or faster?

Would that be possible? I have always thought that once you were first diagnosed, your recurrences would have the same type of tumors (regardless the numbers of recurrneces), meaning always the same growth rate each time. Huh? <scratching on my head in puzzlement>

Thanks