Yes, I withdrew the K1 and submitted for the CR1. The process was not too bad, relatively speaking (this whole process kind of sucks and takes forever). I sent a letter to formally withdraw the K1 and followed the process for the CR1. A little redundant in a few areas, as in paying fees again, filling out a few very similar forms, things like that. I hope that helps a little bit, and feel free to reach out if you have any other questions, and to message me directly.