Yes they are essentially the same thing, definitely some major differences between the two, but you can use both to draw with.
Bamboo has only half as much pen sensitivity, does not register pen tilt, smaller drawing surface, no express keys, no touch strip.
Here's a comparison:
Bamboo - Compare Tablets
Sort of like the differences between a VW and a 7 series BMW.
If you can afford it go with the intuos, I know it's pricier but it's also a professional level tool whereas the bamboo is aimed at the general consumer market.
They are well worth the money. The intuos 6x8 I use at work is probably 5 years old. It used to be mine. When I first took the job I told my boss I needed a tablet, he said fine, get one. What I did was I sold him my 6x8 and used the money to buy a 6x11 for home.
Point is the thing see's daily use for at least 5 years and still works the same as it did the day I took it out of its box. The build quality is really nice.
They are well worth the extra money if you can swing it. Consider it an investment in your career.