AIUI the colours/textures of the inhalers are for functional class, rather than specific drugs. The idea being that you always treat an attack with a blue/smooth inhaler (usually, but not exclusively, salbutamol). Brown/rough is usually a long-term acting preventer (beclometasone, fluticasone, etc) that won't relieve an attack. Other colours can mean a combination of preventer and reliever drugs, more exotic preventers, alternative propellants, a medication for something other than asthma, or that the pharmaceutical company thought they looked pretty.
The great thing about this 'standard' is that it's completely unofficial.
I'm a great believer in liberally distributing salbutamol inhalers throughout my environment for times of need, and if somebody needs to use one, they're welcome to. I don't have time for this singular "your inhaler" rubbish perpetuated by schools, newbie nurses and amateur asthmatics
[1]. That's just a recipe for not having an inhaler when you need one. Yes they do occasionally go out of date: That means I'm winning.
[1] Sometimes GPs like to fob off adults with a cough by prescribing salbutamol without any real follow up. Do they have asthma? Possibly.