why is this function so hard to match

include/frontier_util.h

@@ -17,5 +17,6 @@ bool8 sub_81A6BF4(void);
 u8 sub_81A6CA8(u8, u8);
 void sub_81A3908(void);
 u32 GetCurrentFacilityWinStreak(void);
+void ClearnRankingHallRecords(void);
 
 #endif // GUARD_FRONTIER_UTIL_H

include/save.h

@@ -94,7 +94,7 @@ u16 CalculateChecksum(void *data, u16 size);
 void UpdateSaveAddresses(void);
 u8 HandleSavingData(u8 saveType);
 u8 TrySavingData(u8 saveType);
-u8 sub_8153380(void);
+bool8 sub_8153380(void);
 bool8 sub_81533AC(void);
 u8 sub_81533E0(void);
 u8 sub_8153408(void);