As far as I understand the requirement, there are two scenario
Where a new account is created, two events (with same timestamp) is written
EventCode=624 Message="User Account Created"
and
EventIdentifier=642 "User Account Changed" "User Account Control" "Account Enabled"
When an account is enabled (just enable, not create), one event is written
EventIdentifier=642 "User Account Changed" "User Account Control" "Account Enabled"
and what you wish is the create table for events created for scenario 2 (account enable only)
If this is correct, you can use following.
(EventCode=624 Message="User Account Created") OR (EventIdentifier=642 "User Account Changed" "User Account Control" "Account Enabled" ) | rename New_Account_Name as Account_Name | rename Target_Account_Name as Account_Name| stats count by Account_Name, Caller_User_Name,_time | where count=1
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