The Taliban and al-Qaeda are not the same. The Taliban never left AFG; although their control and influence has waxed and waned but, for obvious reasons, they're making a big push now.
AQ was at the height of their power and influence around 9/11. They're not a cohesive entity with a global reach anymore. Even if you see their name attached to different groups in different countries, I'd take it with a grain of salt that they're actually working under any central authority. Quite frankly, they don't have the capability to launch a terror attack with the sophistication and impact of 9/11. The Taliban never did.