is it correct to expor a fbx file in Cm? and the Physics woulb be correct?

Hi , I would like to know if I export my objects as fbx some of them in meters and some in Cm ( I used a texture atlasing for assets, target Mobile phone ) , I ve a kettle in cm , a cigarrette and a phone in cm , walls , cars and bedroom in meters... I try to use Physics in meshes , but I do know if cm for the small pieces such as cigarrette , phone are ok? should I make the 1 meters as the minimum? or just 0.10 cm as the mininum in clipping camera? . I would like to create my own Psychs by code with my cousin but we take seriously the measurements , cause it is important , I think.

software to use the model (blender) software to use to create texture atlasing (blender) software to use to painting (photoshop).