Thank you all for your answers.
I already knew the answer I just wanted to be sure.
Maybe I wasn't clear but I already Lost the password (because I never saved it because I knew that private key is enough), but then a second later - second guessing came in , because who know, what works for BTC or any other coin not necessarily means it's the same in ETH.
but with that I do understand that it's all comes to the same cryptography- AES128..so the private key can be used after opening a new wallet and import the private key.
Just wanted to be 100% sure that I won't get f in the future.