What is the relationship between Guizhou Expressway Group and Guizhou Highway Development Co., Ltd.?

It's the same company Expressway Development Corporation is the predecessor of Guizhou Expressway Group Co., Ltd. and its current name. Guizhou Expressway Investment Co., Ltd. is a limited liability company wholly owned by Guizhou Expressway Development Corporation with a registered capital of 654.38 billion yuan. Mainly engaged in investment and financing construction, operation management and maintenance of transportation infrastructure projects such as expressways, as well as investment in real estate development, land development, tourism resources development, hotel investment and management, investment and development of science and technology projects, equipment leasing, service area management and other fields.