SunPower Corporation engages in the design, manufacture, and marketing of solar electric power technologies. It operates in two segments, Components and Systems.The Components segment sells solar power products, including solar cells, solar panels, and inverters, which convert sunlight to electricity for the utility networks serving installers and resellers for use in residential and commercial applications. It also sells products for use in multi-megawatt solar power plant applications. The Systems segment offers power systems and system technologies, which include development, engineering, and procurement of permits and equipment, as well as construction management, access to financing, monitoring, and maintenance services. This segment serves commercial and governmental entities, investors, utilities, and production home builders. It has solar power system projects in various countries, including Germany, Italy, Portugal, South Korea, Spain, and the United States. This segment also sells distributed rooftop and ground-mounted solar power systems, and central-station power plants. SunPower Corporation offers its products and services primarily in Asia, Europe, and North America. The company was incorporated in 1985 and is headquartered in San Jose, California. SunPower Corporation (NasdaqGS: SPWR.A)
So pretty much the two are the same company but A is dedicated to one section of the business while B is dedicated to another.