Maybe indirectly it's possible to convert seed using some fork of Mnemonic Code Converter from iancoleman, but I didn't try doing this myself.
It is not possible to generate the same wallet doing this because of the way the seed phrase is turned in to your private keys.
There is approximately a 0.44% chance that a BIP39 seed phrase is also a valid Electrum seed phrase, and there used to be around a 1 in 16 chance that an Electrum seed phrase was a valid BIP39 seed phrase (prior to 4.1.3 when they implemented a check to prevent this). So you could use the same seed phrase to restore both a BIP39 wallet and an Electrum wallet. However, the two wallets you restored would be different because BIP39 uses the word "mnemonic" as part of the salt for PBKDF2, whereas Electrum uses the word "electrum".
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The changes to be made are now on lines 118 and 146 respectively.