Factual error: When Woody is looking at Andy's high school graduation picture in his room, there is a concert ticket in the upper left corner of the screen and another one just below it for a band called "Humble Beginnings" both with a date of Saturday, November 17, 2009. This date fell on a Tuesday. (00:11:15)
Factual error: In the morning after Lotso incarcerates the toys, he bursts into the room in his truck. Just before he enters, we see the room's door handle turn downward and the door swings inward. There is no person or toy on the other side of the door turning that handle.
Answer: Yes, he is. He can be seen wearing the same black t-shirt with a skull motif that his younger self wore in the first movie and Pixar have confirmed that the character's intended to be Sid.
Tailkinker ★
In addition, they are voiced by the same person.