If you didn't change them on Hive, your Steemit keys are still the same and there is no risk in using them on Hive.
If you feel unconfortable with Hivesigner, you should install the Hive Keychain browser extension if you are on a desktop or the Hive Keychain app if you are on Mobile and use HiveAuth as an authentication and transaction signing method.
That's the safest way to manage your keys.