I think that it won't have been weathered as much, mine is also just a slightly different shade (of blue). It would be possible to colour match it to the body if you wanted.I fitted the hardtop that I just bought on ebay. It's in great condition and fits well, but despite checking the paint code with the seller it's a slightly different shade of yellow to the rest of the car. It's not much but it is noticeable so I reckon it'll go for a respray before next winter.
There are other bits of bodywork needing a little attention too so it could get expensive!
I was out in it this morning and it certainly gives the car a different feel.