Hi.
Yes, the first two digits was not displayed in the registration number, even thou it actually was there in the files.
Not until the C-version came along the two first digits was displayed.
About colours I'm not sure.
I haven't dug into that matter but the overall green of the B-version was a little more greyish than the "modern" green and not so dark, spray some dust over and it will be ok.
My own builds has come to a halt due to various reasons, the computer and the family is taking too much time and I haven't found the right mood to place my but in the hoby room.
/Thord