Is being diagnosed with stage 4 colon cancer and being a diagnosed with stage 2 but having a recurrence later the same in terms if prognosis?

Prognosis is stage. It is stage-dependent. Once the Cancer has relapsed the prognosis is bad as the disease is typically fatal. As long as it remains stage-2, there is hope for a better prognosis as long as the disease is not visibly present. In one individual the prognosis and outcome is ultimately same although numerically speaking survival is longer as long as the Cancer has not shown up in the tests.