Can You Use a Wii Rock Band Guitar on Guitar Hero III (Wii)?

No. Controllers are **not cross-compatible** on Wii.

Why?

Different Button Mapping: RB guitar: 5 frets + solo buttons (touch strip). GH3 guitar: 5 frets only. Wii interprets controller ID differently.
Unique USB VID/PID: GH3 only accepts its own guitar IDs (and generic Wii Remote + GH shell).
No Software Remapping: Wii games lack controller config menus.

Game	GH Guitar	RB Guitar	GHWT/RB2+ Guitar
Guitar Hero III	✅	❌	❌
Guitar Hero World Tour / 5 / Warriors of Rock	✅	✅ (5-btn mode)	✅
Rock Band 1	❌	✅	✅
Rock Band 2 / 3 / Beatles / Green Day	✅ (5-btn)	✅	✅

Solution: Use a **Guitar Hero III / World Tour / Warriors of Rock guitar** for GH3. RB guitars work on later GH games (GHWT+), but not GH3.

Nintendo Wii

Nintendo Wii