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It seems to me that they are. I mean you can send test bitcoins to test Litecoin addresses. I don't think it's problem at all, but it can cause some confusion.

Real addresses cannot be mixed, but I managed to send test coins from Litecoin wallet to Bitcoin test wallet. The coins did not come obviously.

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Yes, they're interchangeable.

The components of an address are a prefix byte, a 20-byte public key hash (160 bits), and a 4-byte checksum. Litecoin testnet uses the same prefix byte as Bitcoin testnet (hex 0x6f, decimal 111) and computes the hash and checksum in the same way. This was arguably not a good decision on the part of the Litecoin developers, but we are sort of stuck with it now (maybe until testnet4).

If you have the private key for the address in your Bitcoin wallet client, it should in principle be possible to export it from there and import it into your Litecoin client (they also both use the same prefix byte for testnet private keys).

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  • according bitcoin.stackexchange.com/questions/59736/… importing of private keys is not possible
    – Pavel Niedoba
    Commented Sep 25, 2017 at 16:21
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    Import of individual private keys is possible. You cannot import a mnemonic, seed, or master private key. However you can import individual private keys.
    – Ava Chow ♦
    Commented Sep 25, 2017 at 19:32
  • RIPEMD160 output is 160-bits, so fist paragraph should read ...20-byte public key hash... instead of 160-byte.
    – thalisk
    Commented Jul 3, 2018 at 10:22

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