The Citizen caliber 8213 is an automatic movement based on the Citizen caliber 8210.
Citizen 8213 vs Citizen 8210
The difference between the two movements is that the base caliber 8210 has a central sweeping second hand and the 8213 has a small seconds subdial between 4:00 and 5:00. Both are 21 jewels and are finished similarly.
Note: There is also a caliber 8200 which is the same as the 8210 but has a day/date instead of just a date on the 8210.
Citizen 8213 vs Miyota 8218
The Citizen caliber 8213 is basically Citizen’s branded version of the Miyota (owned by Citizen) caliber 8218. You can learn more about that caliber and see for yourself here.