Whats the difference between SCJP 6.0 exam and SCJP 6.0 upgrade exam ?

SCJP 6.0(CX-066) upgrade examination duration is only 150 minutes whereas SCJP 6.0 (CX-065) exam is 210 minutes. Does it mean SCJP 6.0 Upgrade exam should only be written by persons who have already cleared SCJP 6.0 ?? If not, which is the best to write between SCJP 6.0 and SCJP 6.0 upgrade exam. i havent written SCJP before.Please give suggestion.Thankq

[double post|http://forums.sun.com/thread.jspa?threadID=5325655]

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