VMware strongly recommend to have vCenter Server on same or higher version of ESXi Host build number however practically connecting ESXi Host of a higher build number to vCenter Server may succeed but not recommended by VMware.

VMware vSphere ESXi 5.5
VMware vSphere 5.x
VMware vCenter Server 6.x
VMware vSphere 7.0.x
VMware vSphere ESXi 7.0.x
VMware vCenter Server 7.0.x
VMware vSphere ESXi 8.0.x
VMware vSphere ESXi 6.5
VMware vSphere 6.x
VMware vSphere ESXi 6.7
VMware vSphere ESXi 6.0
VMware vSphere 6.5.x
VMware vCenter Server 8.0

vCenter Server build number has to be higher or same version of ESXi Host build Number.

Note: VMware understands that in certain situations this is impossible to achieve, for example when a new patch for ESXi was released that has a higher build number than the latest available vCenter version.
These situations are an exception of the rule, as long as the vCenter Server is patched to the latest available version.

For more information about vCenter build numbers , see Build numbers and versions of VMware vCenter Server (2143838)
For more information about vSphere ESXi build numbers, see Build numbers and versions of VMware ESXi/ESX (2143832)