Quote Originally Posted by Chaos Jackal View Post
A308 There's no provision in the spell for different sounds, and generally speaking spells do exactly what they say, nothing more, nothing less. So the easiest answer is that you wouldn't know which alarm was triggered, only that one was.

Having different pings for each cast or having you inherently know which is which because you're the caster or whatever is solidly within the realm of "ask your DM".
A simple solution would be to have one Alarm be an audible sound, the other one being a mental signal.