They are not two tone...... different materials and textures reflect light differently. If you get some vinyl spray and spray the lower dash plastic and the crashpad with the same can the crashpad will appear darker.... unless you use black. If you spray your door trims they will also appear darker.

Bare in mind also that the lower dash plastic's, console etc. are painted, the door trims and crashpad are dye impregnated. If the parts were outsourced through different suppliers than colour variations occur with different paint or dye batches.