Kubernetes version and the AMI version to be at the same level ?

Hello,

You can upgarde your eks version from 1.22 to 1.23 with current ami then, after the control plane upgrade you must upgrade the node group version to 1.23. As to further upgrade cluster to any Kubernetes version both the managed nodes and Fargate nodes in your cluster are required to be same as your control plane's version.

You can check this doc 'https://docs.aws.amazon.com/eks/latest/userguide/update-cluster.html' for detailed information on eks upgrade process.