Dart/Barracuda Big block 383 manifolds. 67 vs 68-69 and Exhaust systems

Does anyone have a side by side picture of the differences between a 1967 2899002 drivers manifold vs 1968/69 2949729 drivers manifold. I want to buy exhaust for my 68 barracuda and I think I have the 2899002. Just need to understand the differences before I pull the exhaust trigger.

Also have thoughts on the Ebay system below vs Accurate besides cost?

1968 PLYMOUTH BARRACUDA, VALIANT & SIGNET EXHAUST, ALUMINIZED, WITH 383 ENGINES | eBay

Thanks everyone for the info.