they can ask the same questions, but they won't be answered the same way. AIB doesn't get a list of questions from the SIB, just the list of interviewees.
"Tell me what happened."
SIB = "I accidentally pulled both throttles back to idle, realized my mistake, pushed them immediately forward to MIL, and that caused both engines to compressor stall. I freaked out, forgot my boldface, and ejected."
AIB = "Both engines compressor stalled so I ejected."
AIB is a criminal investigation and there can be serious consequences for whomever is found at fault. SIB doesn't come with any consequences.