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).