All APs(CSL) and Zitron/Avaxx/Sapura are original Nokia set.
the only different is that the APs dealers might provide you a "different" package.
different in size of MMC (APs might provide smaller size of MMC card compare to original package)
different in battery qualities ( APs might provide used battery)
different in charger qualities (3 pins - Malaysia types - Zitron/Avaxx/Sapura ; 2 pins - other country types - mostly APs)
different in phone qualities (APs might selling factory outlet headset which might have minority defect which been rejected(QC) by Zitron/Avaxx/Sapura but still came from original Nokia factory)
different in warranty period (APs 12 months-15 months and accessories 3 months or less ; Original 12 months- headset accessories - 6 months)
different in warranty service (APs sevice center might only open in weekdays ; NCC - open 7 days a week)
different in repair service (APs might take a weeks to repair ; where Ori take an hour - because of lag in expertise )
different in repair quality (APs might provide recon parts to repair you phone ; where Ori mostly use original parts)