There is no Comey memo. 
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This whole situation is a rather gauche deception.
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It would be a punishable act for someone at the FBI to leak this, if it were real. But there is no penalty for lying to the media. 
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Further, the people who read "parts" of the email to the NYT are said to be Comey's associates from the FBI, but what kind of people would leak a friend's private records before he gets a chance to give his testimony in a few days?
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Comey testified just a couple of weeks ago that there had been no pressure. So if this memo is real, why would he have said that.
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There is no Comey memo. The NYT was either fooled, or complicit in a trick.