Targum on Esther identifies Memuchan as Haman (in 1:16):
ממוכן הוא המן
Memuchan, who is Haman
Yet on 4:5, when he identifies Hasach as Daniel, he switches the order:
דניאל דמתקרי התך
Daniel, who is called Hasach
(In the subsequent verses in each part of the Megillah, the Targum consistently uses the names in the Megillah.)
Why is it that in 1:16, he starts off with the name used in the Megillah and identifies who it is only after, while in 4:5, he gives the character's actual name and then refers to him as the Megillah does? Why not, in 4:5, say התך הוא דניאל, or in 1:16 המן דמתקרי ממוכן?