If it's only about a deleted partition (i.e. not a deleted filesystem, not a deleted partition table), then it should be enough to restore the entry in the partition table with the exact values that used to be there. Sometimes an educated guess may help. See this answer for some insight. What is your current partition table? Do you remember where (e.g. between what other partitions) the partition in question used to be? At what sector did you find the "partition header"? (There is no such thing, do you mean "filesystem header"?)
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