Difference Between DF11-2428SCFA and DF11-2428SCFA(04) Contacts from Hirose Electric Co. Ltd

What is the difference between DF11-2428SCFA and DF11-2428SCFA(04) contacts from Hirose. According to documentation found on their website the difference is in the contact carrier. DF11-2428SCFA(04) is gold plated over a tin/nickel carrier and DF11-2428SCFA is gold plated over a nickel carrier.