I really feel for you. I've got new neighbors surrounding my farm, and they have absolutely no idea what it does to my horses when their kids sit on the shed roof and yell or when they ride their ATVs in circles around their backyards for 6 hours. Sadly, we can't retrain our neighbors. We can 1) move our horses, 2) try to train the horses to get used to loud, erratic noises, and 2) learn to ride well enough to sit a spook and make sure our insurance is paid up.
If my 50 years with horses has taught me anything, it's that there's no real way of judging how a particular animal will react to a situation in advance. The fact that one of your horses has adjusted and the other hasn't is a good indication of the individual differences between them. Your second mare may never get used to that sound. From a distance, small motors sound like really big insects and larger engines sound predatory. That's hard for some horses to get over. I have six right now, and only one was able to handle riding in my woods while the guy behind me used dynamite to blast for a new road. The others wouldn't leave the ring, but that one liked to stand and watch the blasting. Go figure.
The best thing you can do for your mare is be calm and confident yourself. If the noise doesn't bother you, that's a step in the right direction. If you're nervous, however, about how your mare will react, she's going to be just a frightened by your tension and fear as by the noise. It's called a self-fulfilling prophecy. What you're afraid of may happen just because you're so afraid of it that you MAKE it happen! I've been there and know how it works.
I'm going to suggest that you spend some time on the ground with your mares, leading them near the sounds and just hanging out with them in a calm frame of mind. Bring carrot chunks. Don't get so close that the mare freaks, but get a little closer each day. That's called "sacking out". Either she'll get used to it or she won't. If she stands quietly chomping grass, then tell her how good she is and give her a carrot chunk. If she freaks, back off and try a little farther away. It took me two years to get my new Appy gelding used to the sound of my boyfriend's welder. That hissing and sparking just about blew that boy out of his skin! Now he's all brave and full of himself and wants to go exploring the farm equipment. Quite a change for a wussy gelding!
Patience! And if that doesn't work, then talk to the neighbors. You can't stop them, but you might be able to work out a compromise where they let you know when they'll be doing their thing so you can avoid being in the saddle. If that fails, then moving may be your only choice.
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