Unfortunately, CCI uses different baselines for SAT and SST, making the comparison more difficult.
SAT baseline = 1979-2000
SST baseline = 1971-2000
So we would expect the anomaly to be different, due to warming during the non-overlapping baseline period of 1971 to 1978... CCI SST anomaly should be slightly higher than SAT anomaly even if the absolute temps are the same.
Physics say the oceans are usually warmer than the air. Shortwave solar energy absorbed by the dark ocean, released to the atmosphere, then to space. Heat flows from warmer to colder.
As Bill F. points out, the monthly datasets and reanalyses like NCEP consistently show absolute SST are higher than SAT.