Outside Regular Trading Hours vs Overnight Trading


My question is for Interactive Brokers specifically, but this might apply more broadly. When placing a trade with IBKR, you have 3 options essentially:
1) Regular trading hours only
2) Regular trading hours plus outside regular trading hours
3) Overnight trading only (and these orders are only valid for that night, you can’t place GTC orders).

I’m trying to figure out the difference between Outside Regular Trading Hours and Overnight Trading.

Are they the same, and the overnight trading option is only for those who want their order to be canceled if not filled by the time the market opens?

If they’re different, is there a way to cover both outside regular trading hours and overnight trading? Since they require separate orders, my worry is that both orders might fill.


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