Align the model to the panorama

I made a scene in blender, a box with several shapes on the ground, I hidden one of the models, rendered a panorama, and then I built a skybox in three.js, put The rendered panorama was pasted on it. After exporting the hidden model and loading it into the scene, I found that I couldn’t completely align the model to the panorama. Does anyone know what the problem is? Please help. I am very grateful, my real project is much more complicated than this scene, I need to do lightweight, and only one part in the real project needs to be able to move.