Yip man lineages say the Wing Chun is Northern Shaolin is different but not really the original. Its basically northern shaolin. Its known as Orthodox Shaolin or Shaolin Wing Chun.
I know this is an old thread but to clear up a few things.
The Chi Sim Weng Chun Pai is not a Northern Shaolin system but it is a Southern Shaolin system as can be seen in nearly all there forms have a southern flare. Even from the opening of the form.
Although I've only seen Fa Kuen, Saam Bai Fut, Sap Yat Kuen, Muk Jong, Long Pole and the Swords.