While the challenges might have been identical, the circumstances around them weren't. With the Saliba red the ball is running directly through on goal with White around 20 yards away - the Bournemouth player would have had a completely free run straight at goal with no chance of an Arsenal player challenging him. With the challenge yesterday the ball isn't running through on goal but closer to the direction of the corner flag and there's a Chelsea defender within 5 yards - Jota would have been running away from goal which would have made it far easier for the Chelsea defender to get back into a covering position before he can get a shot away.