CC's player efficiency rating through her junior year is 37.5. Ionescu's PER for her career was 33.5.
Ionescu had a better assist to turnover ratio, but CC makes up for it because she is better scorer. Part of that CC's higher volume from 3 which increases her points per attempt, but she's also a significantly better shooter inside the arc than Ionescu was, giving her both a higher true FG% and a higher eFG%.
If she wanted to switch jerseys, I'd contribute to that NIL fund. I would take her exactly as she is and I would love it. I feel the same way about most of their stars that I've disliked.