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As a Coptic Orthodox Christian, many of the differences between the two Churches results in the language and definitions of some key orthodox concepts. In fact, much of the Christology of both Churches is the same.
Hesychasm may be experienced by ascetic individuals, usually highly spiritual monks and nuns. Little is known about such matters as these spiritual individuals will not reveal this information voluntarily to anyone except their confession fathers, and their confession fathers will rarely expose this information until their timely repose.
This source is from the Coptic Orthodox Diocese of the Southern United States and is answered by His Grace Bishop Youssef, the presiding bishop of said diocese