No, they are different. Using the wrong one risks damage.
| Spec | DS Lite Charger (WAP-002) | DSi / DSi XL / 3DS Charger (WAP-003) |
|---|---|---|
| Output Voltage | 5.2V | 4.6V |
| Connector | Mini-B (small, rectangular) | Proprietary "DSi" (larger, rounded rectangle) |
| Polarity | Center Positive | Center Positive |
Always match voltage & connector. The USB multi-cable is the best modern solution.