DJ, do take plenty of good photos of the boats, inside and out. But first, make sure they are cleaned up. Assuming you will use the photos to sell the boat, boats do sell for more when the photos show an uncluttered, cleaned up boat. Usually the best way to do that is to secure any valuables, then just hire help to clean & scrub for the day.
If you can go over with the crew, find out what is "special" about the boats. Ask the builder the same question, what was custom contracted for them. You may find that the "custom" part consists solely of a heavier hull or bow construction, for working near ice. Or extra insulation, which can be useful anywhere in the world, and a heating system, again, useful in many places. Depending on how much of what is "custom" the boat may have a better market value elsewhere. Also, if the boat is Chilean flagged (titled) there may be paperwork issues and some buyer reluctance in other nations. The papers which should be secure on the boat someplace will tell you that, among other things.
If you were to bring it north to sell, obviously the voyage up to either California or Florida is a long one. Between the price of flying a US crew down, or sending a Chilean (etc) crew home, and daily rates for the travel, it wouldn't be cheap to bring the boat up.
You might also want to consider which US coast (I'd suspect the Miami market is larger) and contact a big-name broker stateside to ask if they'd be interested in the brokerage sale. They might be capable, and willing, to assist in the delivery home as part and parcel of the deal, which could save you from having to pay out the delivery expenses up front as well. Or, at least to refer you to someone.