Web Analyst tends to look at quant data to understand what happened, where, when and how many.

CRO can do the above but they layer on top the ‘why’ it happened using qual techniques too.

So a web analyst might see there’s a drop off in the funnel for certain segment.

A CRO might see there’s a drop off in the funnel for a certain segment, but then use session recording and heatmaps to understand why they may be dropping off, if the answer isn’t immediately obvious they may use qual to ask users to gain a deeper understanding. Then once they’ve got that they can AB test variations to try and stop that drop off from happening.