Well, a power adapter has three parts:
1. The cord between then mains and the transformer
2. The transformer itself, that makes 19V DC from 110 or 230V AC.
3. The cord between the transformer and the laptop.
If #2 is the same, and #1 and #3 fit into it, all is fine.
my toshiba laptop cords always came in 2 pieces. the part that connects to the laptop itself is messing up. i took the cord apart, and connected my old toshiba plug in, and attached it to my new toshiba cord. basically i now have a cord made of two different toshiba pieces. (does this make sense??). is this bad for my laptop?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic