Is the R2 MIO board the same MIO board of R3? Please some help!

Hi

I will star a new project bulding a PC in the Aurora R2 case.

I did read from a user he did the same project in the R3 case. He connected the R3 MIO board to ASUS Maximus Gene-z/gen3 with no problems at all. 

Is the R2 MIO board = R3 MIO board? Can anyone please tell me the part number of the R3 MIO Board

Thanks!