Mike, what are the differences? (Sorry, I didn't quite understand your earlier explanation.)
I won't try to claim that Mike's experience is unique, but since my parents moved to AZ about 20 years ago, I've played down there a fair amount, and I almost NEVER abandon a ball in the desert. For one thing, when I'm there, the nighttime temps are usually in the 60s, which pretty much eliminates the snake problem.
I have played dozens of rounds on desert courses, and hunted quail a fair amount in AZ, and I never seen a snake.
The last time I was there was last weekend, and we played two rounds on Longbow, where there's still a fair amount of desert, and two of us spent some time off the grass. We found nearly every ball and played most of them.
( I never took a penalty stroke, and the other guy had about 3 or 4 drops)
There are courses where it's a problem, Ancala was one of them. The desert there was almost untouched when Iplayed it, and there was only about a foot of short rough between the fairway and rocks/bushes/gravel. But even there, the members carry a "rock club" to allow them to play out of the desert.
FWIW -- I was at a swap meet there last Sat. and one of the golf dealers had a barrel of used 6 irons from a demo program labeled "Rock Clubs $5.00 each."
I've not been to Pine Valley, but it's pretty clear that the sand there is almost like a bunker. The desert is more like a gravel road.
K