Go to Tamiya America and check out the chassis section. There, you'll find answers to your Q's. I would tell you, but I don't own a TT01, though Ihave buds who do, and they would know, but they're not here. The section that lists all their RC model line will have the chassis you're looking at. Iwas just there, and they have the new models listed!

All that aside, There aren't any major differences.

Tamiya has a habit of altering their chassis with option parts for some models, some not. It's a matter of what you want, which is why I steer you to Tamiya America. Don't pay attention to the prices - you'll be able to find them cheaper at any distributor.
With most of their kits not labeled "pro", since bodies, wheels and tires are included, they omit option parts. The "pro" chassis WILLhave option parts, but no body, and in some cases, no tires, and in a few cases, no wheels, either.
Most of the TT01 kits have those parts, so you will only need to supply the power system and RX/TX. If you want a kit with option parts, you'll have to graduate to a "pro" kit, which will not bea TT01, and from what Ihear, those parts you previously listed are the ones to get.

With that in mind, if you stay with drift, you can graduate to something a bit more complicated, like a TA05 ver.II, and option parts are all over the place for those. Even the TB03 is being upgraded.