On the other hand, PCBA (Printed Circuit Board Assembly) is the pcb board which obtains after all printing solder paste on the PCB and then mounting various components like resistors, ICs (Integrated Circuits), capacitors and any other components like transformers depending on the application and desired characteristics of the board.PCBA usually undergoes reflow furnace heating so as to establish a mechanical connection between the PCB and the components.
Maybe it’s helpful to you: