I think both codes are for the same colour.
I am in the same boat with lots of small stone chips to fill in on the bonnet.
Where do plan on ordering paint from?
I am leaning towards paints4u purely due to the good price of their kit.
Please keep us posted with your results
Found one on ebay which seemed a good price but will also check out that paints4u website you mentioned . My ridiculous worry is that the paint doesnt match or I make it look worse !