There are different types of ASIC and AVID cards. Retail staff at airports seem to have different types.
Pilot ASIC cards are different because they include your ARN.
. There are 2 types/colours. The grey coloured ASIC is for landside only. The Red ASIC is for Airside. Pilots would have the red card. They are not "different". It is the same card with the same authority as OPs staff, refuelers, engineers and anyone else with a VALID reason to be airside. Retail staff would not have a valid reason to be airside and would be issued with the grey cards.
I have never been upgraded when checking in and using my ASIC as ID. I have been upgraded a few time when self checking in (and once got bumped up to the jumpseat of a 76. It was not as fun as it sounds).
and yes, grrowler, is correct. It is actually illegal to use your ASIC for a purpose other then what its intended to be used for. If you happen to be wearing one in uniform at the airport while on duty and the nice lady at Dome gives you a discount, then thats your fortune.