Ia the same person who plays the voice of chi in chobits the same person who sings the opening?

the opening song

http://www.youtube.com/watch?v=tkrpLjQScHY

No, not at all.

Chi was voiced by Rie Tanaka

The opening song was performed by the band ROUND TABLE (yes in all caps...strange name) and ROUND TABLE does not have Rie Tanaka as a member. Their lead singer is a lady named Nino. They do a lot of anime openings. ^_^

i think so, they sound alike