Just been playing with some numbers for this launch.
SJ-16-1 was launched into a 601-616 km orbit while SJ-16-2 was initially 596-616 km.
On December 16, 2016 the orbit of SJ-16-2 was raised to 606-617 km and again on December 18 to 608-617 km. SJ-16-1 atthat time was in a 598-627 km orbit with essentially the same orbital period. The orbital planes are about 90 degrees apart and the satellites are crossing the equator at pretty-much the same time.