The 2014 iMac will likely have problems as it is not supported by Ventura. Host graphics and CPU need to be compatible. I have Ventura running as a VMware Fusion client on my Monterey 2019 iMac - not easy, but can be made to work - your unsupported iMac just makes it one step harder.
The 2021 MBP is Apple Silicon and, as has been said, you can only virtualise Ventura on a Ventura host.
Go to Mr Macintosh web site. His links for macOS distribution are from Apple's servers.