Welcome!!
The colouring is very confusing, isn't it!!
From what I can gather Orange was generally used in show lines, while lemon was used in working lines, for very similar colours (the show lines were generally a darker, richer colour), but it does seem to have blurred at the edges now - our pup, Honey, is 3/4 working line, but registered as Orange Roan, as her markings are darker than her litter mate, who was registered as Lemon Roan.
The pink on the pads decides whether the colouration is xxx Roan or xxx and White. I can't see pink on the pads on the photos you posted?? Are there still pink patches there? If so, then he will be "and white", if the pads are a solid colour he is a "roan".
Whatever his official colour is, he is gorgeous!!!
As Livercake says, his colouring will darken over the next fe weeks and if she is Roan this will become more pronounced!