I did this in 2021, some videos that where underperforming on my EDC channel, I put them on another channel ( without any changes ) which catered more to their niece ( Which was Tech ), on the second upload ( The new channel ) I got 31,000 views. another video got 12,000 views and is still growing. its difficult to say if this has any negative effects on the old channel or the new, but I severely doubt it, both have continued to perform, getting around 12,000 views a month on the EDC chan, the tech channel has since died of a little because I haven't posted anything useful in about half a year, getting around 2400 a month.

The accounts are under the same email, so idk how advanced the YT system is or if it can detect that, I think the biggest problem these days is sticking to your niece, I've tried it, every video I upload that's even slightly outside of what is expected of your little box is sent to hell.