The Selangor nobat is also known as Anak Nobat Perak. This is likely to do with the installation of Raja Lumu by Sultan Mahmud Shah, the 16th Sultan of Perak, in the 1770s, which was accompanied by the nobat of Perak.
Source: Skeat, William Walter. Malay Magic-An Introduction To The Folklore and Popular Religion Of The Malay Peninsula. MacMillan: London; 1900.