trigger = issue updated
condition: jql = issue key
but this one will only update the 1 specific issue key
or do you mean a branch rule?
As you are using server version, you will need to do what @Alexander Pappert suggests, by branching on JQL for the specific issue key, and then using the link action from there to link to the trigger issue.
If you were using Cloud version, you could do this by first putting the key in a created variable and then using that directly, without the branch.
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