One is an ingredient or staple, the other a dish. There are many ways of cooking Nasi Goreng but we would probably all agree that its main component is rice.
In computer systems the analogy would be between “System on Chips (SoC)” (complex integrated chips with a processor) and “Embedded Computer Systems” (electronic product consisting of hard- and software). Just like rice can be used in many different dishes, the SoC appears in different embedded devices.