«قَامَ الَّذِي ضَرَبْتُهُ»: the object ʿāʾid «هُ» is explicit.
«قَامَ الَّذِي ضَرَبْتُ»: the accusative returning object is omitted.
The core meaning is the same. The «تُ» of «ضَرَبْتُ» is the first-person subject, not the ʿāʾid.
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Overt versus omitted returning object
Relative Nouns — Ṣilah, ʿĀʾid, Forms and Syntax
«قَامَ الَّذِي ضَرَبْتُهُ»: the object ʿāʾid «هُ» is explicit.
«قَامَ الَّذِي ضَرَبْتُ»: the accusative returning object is omitted.
The core meaning is the same. The «تُ» of «ضَرَبْتُ» is the first-person subject, not the ʿāʾid.