thanks for your question and welcome to the community. You can't Change your refugee travel documents and residence permits with that of any other EU country. Its not possible. But if you already Hold a Greece Permanent Residence Permits you can go to any Eu country and apply for their Residence Permits there. But keep in mind that will be only possible if you find a Job there and also show that you can support yourself financially and that you have adequate accommodation and health insurance.
Good luck and best regards