"EC XXX bits (SHAXXXwithRSA)" versus "EC XXX bits (SHAXXXwithECDSA)"? What's the difference? Does it matter?

If I sign up for the allow list, would I still be able to request an RSA certificate using --rsa-key-size if I wanted to? And the RSA certificate would be signed by R3? Only certificates requested using --key-type ecdsa would be signed by E1? Am I understanding?

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