There are also some search ranking factors like domain age or aged links coming into that domain that won't transition over in the switch. (stemlegal.com)
SerpIQ analyzed over 160,000 SERPs and 1.6 million URLs and concluded that domain age contributed to # 1 rankings for the majority of the domain names in their study: (neilpatel.com)
In fact, Google has even stepped forward to tell us a little bit about the importance of domain age, though as usual they're still holding their cards close to their chest. (ecreativeim.com)