Honestly it’s EXTREMELY close. I would guess the factory privacy glass is about 20ish. So the 15 on the fronts is slightly darker than factory . But when they put the air80 over the factory privacy tint I believe it darkened it very slightly , enough to bring it pretty close to the 15 .
Im already an old man and my eyes are tired, so I didn’t want to add on darkness to the factory privacy glass, but I’m also anal as hell so I wanted to match the front and back glass. Also I wanted the heat rejection all around above all else .I think it worked out.