Not sure how you mean; the Pi 3B+ has RUN plus GLOBAL_EN, the Pi 3B has RUN.
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-.- 3V3 .|. |_| 10K External Diode | signal >---|<|---(o---^---<> RUN
All B models have the RUN feature.
Connecting RUN to 0V when the Pi is running will stop it running and then hold it in its reset state.