现在有两种器件上丝印字母“T3FS”，型号应该都是TL431BIDBZR。其中有些器件3和F上面有上划线，S有下划线；有些器件3上面有上划线，F下面有下划线。
请问这两种不同标示器件的差异在什么地方？
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