Yes their is maybe some similarity or connection between Dorfner...

Yes their is maybe some similarity or connection between Dorfner and RNU purification process but it is hard to say at the moment without much concrete info. The only thing i know is that RNU process was validated by Dorfner which means that it was tested third party and passed for battery grade. Now, whether RNU purification process is heavily similar or slightly different who knows. RNU uses roasting technique which bomber has highlighted that Dorfner mentions as well in their company information, I am not chemical engineering but they both utilise or mention this technique but is their variations to it? That as far as I know

During this time, Renascor developed a caustic roasting technique to purify Siviour graphite concentrates to over 99.95 per cent carbon which is the minimum purity level when being incorporated natural flake graphite into lithium-ion battery anodes.