The first quote talks of "changing" reality, the second talks of "creating" it, making the first seem like an encouragement to try and change reality, and the second like sollipsism.
I think this is exactly the same thing. When you change existing reality you create new reality.
The second also seems very dismissive of the need to think before you act
I read it more as pointing out that what many accept as immutable is actually mutable and changeable. This also plays into the agent vs NPC distinction (see e.g. here).
Another month, another rationality quotes thread. The rules are: