Is Terra the same person as Xehanort?

there are 2 theries neither are proven yet you choose wich to believe

1st theory

xemnas and terra are the same person because if you watch the bbs trailer his eyes turn brown like xemnas also in one of the ansem reports it says something aboute ansem saying his memory is erased and that his only memory is about master xheornort(he is also in the trailer he is the guy with the beard)and he thinks he is master xehornort and in another report he said he used the darkness on his 6 recruits(not sure if this is the right number) but he turns into a heartless wich also releases a nobody wich is xemnas.the six recruits i believe became the original organization 13 members.also in final mix of kh2 u see some one walk down this secret basement and he opens this door then passes a hall of doors and in this room in front of a chair shaped like a nobody simbol is aquas armor with her key blade that she used in the trailer stuck in the ground and the hooded man says at last my friennd we soon will be united again .the heartsless that was released was wich u might know is the last boss in kh1 wich is rikus darkness that he released on roxas to stop him from fullfilling releasing kingdom hearts because xion sayed for him to release the hearts she has collected. p.s. riku stopped him because he knew that his plan would end in failure and also he wanted sora back.also in final mix of kh2 u see some one walk down this secret basement and he opens this door then passes a hall of doors and in this room in front ofa chair shaped like a nobody simbol is aquas armor with her key blade that she used in the trailer stuck in the ground and the hooded man says at last my friennd we soon will be united again.

second theory

(not to throw you off but this is my sort of unproven theory)

i believe xigbar could be terra becaus in 358/2 days xion appears to be ven ( i think that xion is Sean differently by everyone) some see her just hooded and roxas sees her as kairi with black hair because kairi is soras strongest memory but xigbar sees her as ven his old freind. and also before sora fights xigbar he says that sora looks to be weaker than the other keyblade weilders. hint: he cant be talking aboute xion and roxas because when xion dies every one forgets aboute her wich means hes talking aboute ven,terra, and aqua. and also he could be covering up his eye that is blue with the eye patch he always wears.

sorry to make it so long but this the easist way to tell u with out u getting confused

Here let me help you on this. Xehanort possesses Terra's body in BBS. Since Xehanort dies, Terra dies too. That's why Terra and Xemnas look alike. Because Xemnas IS Terra.