Difference in Precision Between Parts and the Whole Object When Performing Photogrammetry on a Room

Possibly, it really depends on the capture. But normally the quality is retained, but your render of the area should be significantly better than what you saw in the viewport, as when RC converts the 192 8k textures down to 1 16k texture, the texture you see in the viewport will be about 50 times worse than the texture that is actually on your model and the one that would be exported. The only thing that might make the quality of some parts worse is if you have photos from a lot further away that also “hit” the area, because they have far less precision they will most likely make the mesh and the texture worse, although both algorithms do account for this. you might be able to get away with disabling these images for meshing and texturing unless they are important for another area.