Hello Harold, to me most of your colours are well within an acceptable range. As for your individual concerns:
1. - topside Dark Green paint is less than 2% darker than the Illiad swatch. Your paint does have a bit more blue in it, and that is what is likely making it less than a perfect match. You could try adding about 10% of the Dark Earth to shift it?
2. - interior colour looks fine to me.
3. - russet coloured seat also looks fine. These were plastic seats introduced around mid 1940. Very likely contracted out to independedent manufacturer(s), so it would be understandable for some colour variance from batch to batch.
regards,
Jack