Fusion 13.6.2 is the latest and is compatible with Ventura. 13.6.1 is also compatible with Ventura. Both are available from the Broadcom software download site.
What is the exact error message that is being shown by Fusion?
VMs created with older versions of Fusion should run on newer versions**. They may ask to upgrade the VM (i.e. upgrade the virtual hardware version) the first time the VM is powered on under a new Fusion version.
** Only when remaining on the same CPU architecture. VMs created on an Intel Mac won't run under an Apple Silicon Mac (M-series).