Do searchs bot understand SEF and non SEF url as the same ones ?

[AymanH]

I've jsut realized that since almost for ever I use to code first my website using the non sef for internal linkings. It's very convenient as I'm sure that what ever will be the final url the link will always be good.

ex: website.com/component1/id=1

Before releasing the website I use extensions to make the url user friendly according the choosen strategy.

ex: website.com/component1/id=1  -> website.com/article1.html

But I just wondered if google consider both urls as the same ones or if it consider just as a 301 redirection.

What do you think is the best to do ?

[Crocodesign]

Google considers both url's as different.

In your use case, i would use a robots.txt file to prevent google from indexing the site / pages. 
When the site is released and the url's are permanent, you can remove the robots.txt

More about robots.txt : http://en.wikipedia.org/wiki/Robots_exclusion_standard