The more modern forms of nasal spray applicators are capable of producing a fine mist and have a counter to control the dose.
Simpler devices are just a squeeze ot rwo with drop size dependent on how hard the squeeze.
So there may be several options on the concentration of astodrimer sodium in the inhaler.
Then there are the additives, lots of options there, one assumes some sort of saline carrier but there may be some form of detergent to reduce the surface tension (to reduce the size of droplets).
Does that help?
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