Difference between annotations configuration.konghq.com and konghq.com/override?

I use Kong in Kubernetes.
I have a KongIngress that I apply to a Kubernetes service and a Kubernetes ingress.

When I applied my KongIngress using annotation configuration.konghq.com, it had no effect at all. However I see it done this way sometiimes on the internet.

When I appplied my KongIngress using annotation konghq.com/override then it worked. Why?

What is the difference??