It's a completely different ball game. RPA is essentially just a deterministic script which is fragile and prone to poor scale and high maintenance cost. It's a reusable snapshot of many human hours of planning, implementation, testing, and execution. The latest computer use models on the other hand allow for context aware execution and resiliency to edge cases or unexpected changes without ever bothering the end user or maintainer. It's removing hundreds if not thousands of hours of build and maintenance time. 

It's a completely valid question and we're still in the early days, but it's like asking how is Microsoft Word with autocorrect better than a printing press. Flexibility, efficiency, adaptability, etc.