Possible 2 different cancers in lungs?

On 5/1/25 I had an ION CT Scan and then a Pet Scan of my lungs. On the CT Scan it showed a 6mm node that was a 5mm node 1 month ago and it also showed the 1 cm node that was new 1 month ago and unchanged now. The PET Scan showed two and possibly 3 areas that lit up. The first area was the 1cm node in my right upper lobe and the 2nd was a new 5mm node in my left upper lobe. There was one other area that my doctor showed me that looked like a cloud and in the center there was something that lit up dimly. My question is about something my Pulmonologist said. he said " We are going to do a robotic CT guided biopsy of the node in my right lobe and the one in my left lobe. He said he hoped they were the same cancer and they caught it early. The best case scenario is that both nodes are the same type of cancer, but they developed separately in each lobe and if they are different cancers, that would be Bad." I asked him to elaborate on "Bad," but he didn't. Is it common to have two different types of cancers in your lungs? Also, what makes that a worse case scenario? Thank you for any responses to my query.