If the original prescription of colour still exists and the lab that made it is still manufacturing and the same dentist is being used, then there is a good chance that all can be matched again precisely. If not, with the latest technology, this problem can be easily overcome using colour measurement guns and digital photography.
If it is an old crown, you should weigh up the pros and cons of replacing other old crowns in your mouth at the same time. The pros being you get a much better colour match. This is a good opportunity to check for decay under old crowns, therefore ensuring longevity of your root stumps and root canals.
If starting again, technology has moved on and much more aesthetic and realistic results are achievable, as materials have improved. The concept of colour management can also play a part for long-term colour stability within the whole of the oral environment. The cons are this all costs much more money.