Thanks to Kyle, names now IDed as SAN HANG PAO 4 (IMO 8603676) and SAN HANG PAO 3 (IMO 8858295). Clearly now reverted from Panama to Chinese flag. Listed as stone carriers - they are clearly split hoppers.

These are in colours of the China Communications Construction Company (CCCC) Group, which includes CCCC China Harbor Engineering Co and CCCC Guangzhou Dredging Co. The latter has been working on a big breakwater reinforcement contract at Oran: http://en.ccccltd.cn/newscentre/businessupdate/201106/t20110616_5089.html

Unfortunately the dredging company's online fleetlist only covers dredgers, not hoppers and cannot match this pair to any with IMO numbers.
http://www.ccgdc.com/en/equipment/index.aspx