split LED current over 2 sinks
Combining controlled or Constant Current (CC) sinks (or sources) in parallel may be added to a single load (s) as long as the resulting voltage is within the specified range, which is true in this case.

Other info

The same is true, for PTC polyfuses which are resettable current limiters.

However, not part of this question, constant voltage sources ( power supplies ) with current sharing links to each other for redundancy can have stability issues under 10% of the rated load.