AH-64 Apache helicopters sound similar to most every other turbine engine helicopter. I doubt that you could distinguish between them, especially not at any distance.
Do you think that is is possible that someone can? Just not me? Or literally impossible?
I would also encourage you not to make assumptions about the background of a random person on the internet.
My dad can identify fighter aircraft by engine sound alone, he is/was just really really into military aircraft. He gave me a CD once of mp3s of just the sound of jets flying by. To me, it was just a headache generator hah.
I don't doubt for one second you can identify an Apache by sound.
