Arbitration problem: one video, several channels. But if you publish one file without changes, the results will be worse than expected. Let's figure out why - and what to really do.
Content ID vs duplicate detection
Content ID is a YouTube system for protecting others' intellectual property. For your own advertising content without someone else's music, it is not relevant. Duplicate detection is a separate anti-spam mechanism.
What actually happens with a full take
Potential reduction in distribution priority for repeat publications. You don't get two identical Shorts on different channels competing for the same audience.
Practical approach: not copies, but versions
To prepare these versions, it is convenient to use a specialized tool. 360° Uniquizer allows you to create a package of variations with really different visual and audio parameters, unique metadata - in batch mode.
Total
You can publish one Shorts to several channels, but the result will be noticeably worse than if each channel receives a really different version.
FAQ
Content ID will work if I upload my content?
No. Content ID - to protect other people's music and films. It is not relevant for your own advertising content without someone else's music.
Does this mean the video will be deleted?
Not necessary. More likely - reduced distribution priority.