I think I need to repeat my question

at the moment my units run with Raspberry PI4 and I don't like it because of more cables flying around.
Can I replace Orange Pi4 with Orange PI4 LTS and flash it with publicly available Apollo BTC image? Will it work?
Nope, it won't work. It's compiled for a different chip.
What kind of PI board is installed in last batch of full units? Orange PI4 seems to be not available anymore.
Orange Pi 4. At least in batch 3, since that's what I have. I also don't think they changed it in batch 4, otherwise there would be binaries available for a new SBC in the mega folder.
Batch 4 will use our custom version of the LTS board, so we will be providing an image that should also work with the generic LTS board as well.