As you may have guessed by the variety of answers you've received, all of us are unclear what your motivation for a "switch" would be. The odds of finding the one person who wants your home in exchange for theirs, which would be right for you, are infinitesimal.
Any time you decrease the number of available buyers in the pool, you decrease your odds on getting the best price.
My advice, based solely on the information at hand, is to do an exchange: you pick the house you want, your buyer buys that house, then exchanges it for yours. The logistics and process of selling a property and then buying another property are practically identical to any standardized sale and buying situation.
However, this may be completely unnecessary, based on your own personal situation, and not the simplest solution. There are many options available to you: sale and leaseback, lease after purchase, and straight sale.
Please allow me to sit down with you for a quiet conversation to discuss your options.
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