Koukaku Kidoutai S.A.C. 2nd GIG, Kidou Keisatsu Patlabor 2 the Movie Recommendations
Kenji Kamiyama's mentor and the man most responsible for 'Ghost in the Shell' as we know it, Mamoru Oshii, was asked for his ideas when season two of 'Stand Alone Complex' was first being conceived. The end result was essentially a remake - with edits - of another of Oshii's movies: Patlabor 2.
Both Patlabor 2 and SAC2 share an equal parts interesting and gripping premise: an attempt is made to orchestrate a Japanese civil war by a third party for their own interests, and as the crisis escalates, the core cast of main characters from both series find themselves as the only ones aware the
Both have realistic near-future science fiction settings in which teams of (mostly) competent professional adult protagonists combat crime. Both combine sociopolitical themes with tense action. Both were done by Production I.G.
There are also plot similarities, but elaborating on those would go into spoiler territory.