answer 1
The White t3's are much lighter in weight and are not as noisy as it's pink counterpart. As far as wattage goes, they are the same. 1800 to be exact.
answer 2
This is from the T3 site on the difference:
"T3 is known for its award-winning professional styling tools. If there is one thing that T3 tools have in common: it's our Flawless™ Tourmaline technology that revolutionized hair styling with its faster drying times, elimination of frizz and reduction in damage caused to hair during styling. The secret is in......shiny, sleek results.
T3's Bespoke Collection of professional tools is our premium, most advanced collection featuring our most sophisticated and cutting-edge technology and design. These products also feature unique, customized componentry such as our softAire™ technology filter system, SmartPipes™ digital heating system and instant heat recovery, precision-engineered plates and our proprietary motors that are long-lasting, powerful, quiet and lightweight. Bespoke products carry a four-year warranty to ensure their performance meets the standards of our most demanding professionals and their discerning clients.
Our PRO Collection is our standard line of professional styling tools that are as pretty as they are powerful. All PRO products feature our Flawless™ Tourmaline technology and the results T3 customers have come to expect from our products. PRO Dryers sound and feel a bit more like a conventional dryer but with the advantages of our revolutionary Tourmaline technology. The 1800W dryer dries hair nearly twice as fast, while delivering less frizz and better conditioned, truly salon fabulous results. PRO irons feature our precision-engineered plates, fast heat up, 5 times per second heat recovery and a professional, 10 ft length cord. PRO products carry a two-year warranty."