Unlike academic conferences and journals, it is common to submit the same talk proposal to multiple PyCon held in different countries/places simultaneously.
For other tech conferences, I have neither participated in nor submitted a talk proposal, so I don’t know the situation. You should check the conference’s website or ask the organizer or experienced people around you.
In 2022, I presented a talk titled “Real-time browser-ready computer vision apps with Streamlit” at EuroPython 2022 and PyCon APAC 2022. This time, I first submitted the talk proposal to PyCon US 2022, then before the result came out, I submitted the same talk proposal to EuroPython and PyCon APAC as well. Because it was my first time to submit a talk proposal to PyCon, I was not sure if it was OK to submit the same talk proposal to multiple PyCon, so I asked the EuroPython and PyCon APAC organizers via e-mails. Then they said it was OK.
After I entered the PyCon sphere, I found that it is actually common. Many people do this, and it is sometimes a good strategy for them to make travel to many countries! (See my related post👉 Conf-driven Traveling✈️).
I wrote this post because I couldn’t find any information clearly answering this question on the Internet.