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Computer organization refers to the operational units and their interconnections that realize the architectural specifications. Examples of organizational attributes include those hardware details transparent to the programmer, such as control signals, interfaces between the computer and peripherals, and the memory technology used.
Ex: Two different models from a same vendor like Intel are brought to analyze. Both the models (laptop and desktop) have same processor like core 2 duo. That means both models understand the same instruction set as we know each processor understands a fixed no of instructions. Henceforth their architecture is same. Due to the placement of various hardware components, one model (laptop) is slim and other is bulky. Hence their organization is different.