Can browned cyprus trees be saved?

Browning on newly planted Leyland cypress could be caused by a number of different things. Perhaps the two trees that are turning brown are suffering from moisture stress. If their roots haven't spread into surrounding soil, newly plantedtrees need close attention to watering.

This may give you some insight: https://www.bhg.com/gardening/trees-shrubs-vines/trees/why-are-my-leyland-cypress-turning-brown/

you need advice from a licensed / certified arborist; if none in your area, contact your local Agricultural Agency ( under your State/County Government listings)

how were they planted?

Water deprived or a pest issue

Yes - either they did not get enough long slow soaking or it is an insect/mite that is killing them.

Virginia, I researched on-line and there are numerous websites with good advice. I am going to attempt to attach a link to what looks like a good one. Go to the website: USDA.gov/Extension Services and enter what state you reside in. I went to the website and signed up to the site. Now I will be able to answer a lot more questions for folks with plant, wildlife and gardening.

First - Where do you live ? Go to Bing or Google and type in: USDA.gov/extension I was so happy to find this site I signed up for a Membership. The site allows you to pick only what you are interested in researching. Rick Allen