A lot of the texture nodes where updated to the newer industry standard in 2.82 so they all work slightly different. In some you will need to change to 2D instead of the default of 3D to get similar results. In 4.0 the principle shader has been changed. mostly different names and collapsible subpanels, but SSS and sheen have been reordered in the processing and mixing order. So be prepared to do some exploring.
