- If your address starting with "1" then your derivation path will be m/44'/0'/0'
- If your address starting with "3" then your derivation path will be m/49'/0'/0'
- If your address starting with "bc1" then your derivation path will be m/84'/0'/0'
This will only work if he's importing the BIP39 SEED, not the private key and with the latest version, this is not necessary.
After pasting the SEED, check "
BIP39", and after pressing "
next", there will be a checkbox of the available address type,
he can just select, "
Legacy", "
Native-SegWit" and "
P2SH-Nested Segwit" to match the original addresses.