DS2246 = 6 designates = 6gbps - max backplane IO SAS Speed of the Shelf
DS224C = 'C' designates = 12gbps - max backplane IO SAS Speed of the Shelf (C represents number '12' in Hexadecimal format).
Both packs 24 drives per enclosure in 2U rack unit size.
According to IMT, DS224C Does show support for - X425A-R6 drive (1.2TB, 10K, BCS)
But, check it yourself:
https://hwu.netapp.com/