While there is a massive difference between the newest models and the B-27J and Ki-84-Ia, they are indeed the earliest AH2 standard models, along with the T-34/76. All of the AH1 models need to be redone before the older AH2 models get redone.
B-26 and C.205/C.202 are the oldest models in AH now, followed by the Lancaster, Ju88 and Panzer IV H.