The m2aXXY (m2a33L) format is the correct format for the minimag. The XX is the color, and the Y is a designator for blister pack, black clamshell, etc.
One thing.... my teal I got from you doesn't have the new style bulb. The overall light's likely several years old. I think the new style bulbs (green or black bulb base) started coming out 4 years ago maybe.