What is difference btw "multiple labelSelector" or "muiltiple matchExpressions in a single labelSelector" in podAntiAffinity

General Discussions
,
1

Ex.1

affinity:
  podAntiAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
            - key: common.k8s.elastic.co/type
              operator: Exists
        topologyKey: "kubernetes.io/hostname"
      - labelSelector:
          matchExpressions:
            - key: app
              operator: In
              values:
                - prometheus
        topologyKey: "kubernetes.io/hostname"

Ex.2

affinity:
  podAntiAffinity:
    requiredDuringSchedulingIgnoredDuringExecution:
      - labelSelector:
          matchExpressions:
            - key: common.k8s.elastic.co/type
              operator: Exists
            - key: app
              operator: In
              values:
                - prometheus
        topologyKey: "kubernetes.io/hostname"

Kubernetes version: 1.23

I’m not sure these 2 examples are the same. I presume that Ex.1 is “OR” and Ex.2 is “AND”.
So, what dose is difference?