Which is the right address from Electrum

[Pmalek]

When you want to import a bitcoin wallet on trustwallet, there is only one option which is secret phrase.

That doesn't make sense, but then again, so much what Trust Wallet is doing doesn't make sense. If they cared about their customers (which they don't), one could argue that they don't allow importing individual private keys to help in preventing address reuse for privacy reasons. But that's surely not it. Ethereum and its tokens are all on the same address, so it doesn't make much difference whether you have a seed or private key. Except that the former is more user-friendly to back up than the latter.

[pooya87]

one could argue that they don't allow importing individual private keys to help in preventing address reuse for privacy reasons.

That is still not enough reason to not have such a useful feature though. Not to mention that privacy is not a solid reason (it is not like security related reasons). Many users have paper wallets they want to import and there is no privacy related issues there.
Another case could be someone who just wants to expose a single key from their deterministic cold wallet instead of importing the seed phrase and expose all of it which is also a privacy issue since it will link all those addresses together as they are sent to their servers while syncing.

[Pmalek]

That is still not enough reason to not have such a useful feature though. Not to mention that privacy is not a solid reason (it is not like security related reasons).

Maybe the developers of Trust Wallet know that their software is badly configured and makes the change from a not fully spent UTXO move to an address different from the one whose private key you imported. Something like that is possible, I think. That would then be a security risk. Instead of spending time fixing it, it would be easier for them to remove the option of importing a single private key.