TLS1.2
In case of TLS1.2 RSA is used for symmetric key encrypting and exchange and no PFS. If someone find server private key they can decrypt symmetric key and read the content.
TLS1.3
In TLS 1.2 we have two round of message exchange whereas in TLS1.3 there is one round of message exchange.
In TLS 1.3 DH is used for symmetric key exchange and PFS is supported.
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