Direct profile-to-profile save transfer on the same Xbox 360 is not officially supported. Save files are cryptographically bound to the signing profile's XUID.
Workarounds (Varying Reliability)
Cloud Saves (if game supports it):
Sign in as Profile A → Move save to Cloud (System Settings → Memory → Cloud Saved Games).
Sign in as Profile B → Download save from Cloud.
Only works for games with cloud save support (many late-era titles).
External Storage (USB/HDD) — Manual Copy:
Plug USB drive formatted for Xbox 360.
System Settings → Memory → USB Drive → Games → Game Name → Profile A's save → Copy/Move to USB.
Sign in as Profile B → Move from USB to Profile B's storage.
Often fails: Console refuses to move saves between profiles due to XUID mismatch.
Game-Specific Features:
Some games (e.g., Borderlands 2, Destiny) have online character servers—log in with Profile B, download cloud character.
Check the game's manual or support site.
Critical Warning
Save transfers between profiles frequently cause corruption, "corrupt save" errors, or missing content.
Always back up the original save to a second USB drive before attempting.
Achievements are tied to the earning profile—transferred saves won't grant them to the new profile.
If possible, just play on the original profile. The gamerscore and history belong there.