Not exactly the same thing. From the below article:
1. While the transition’s announcement Friday makes sense, it also may be mostly symbolic, as it’s not clear that the practice of keeping doses in reserve was going to be permanent. Last week, Nancy Messonnier, an expert at the Centers for Disease Control and Prevention, indicated during a STAT virtual event that the policy was a moving target.
2. Over time, holding the doses in reserve made less and less sense. A recent analysis published by researchers in Ottawa argued that even holding half the doses in reserve would mean more people would get Covid. Holding them all in reserve only makes sense if a massive shortfall in manufacturing is expected.