they are 2 separate petitions with different criteria but that is what I did

you need to submit a new I-140 application

thanks. yes, I understand they are independent processes. my question is more so what kind of new credentials did you have to make the transition? thanks!

what if my recommendation letters for eb2 has eb2-niw as subject. can I reuse it for my EB1 application or I need to find another letter?

@Aaa A it's better to get new RLs. You need to frame them to support outstanding performance of the petitioner.