The 25 lbs alone separates Smart and Westbrook quite a bit. Height and length matches well, but I think Smart shares more in common w/ Chauncey than Westbrook.
Chauncey was also 6'3" and carried a bit more weight, around 210. He'd use the size and strength to bully defenders.
College stats compare closely over each player's 2 year average:
Chauncey: 18.5 pts, 5.1 ast, 5.6 rbs, .413, .382, .857 in 34 mins.
Smart: 16.6 pts, 4.5 ast, 5.9 rbs, .488, .295, .751 in 33 mins.
Chauncey shot worse from 2 but better from 3 and at the line. Points, assists and boards are all in the same ballpark, especially in the Sophomore seasons.
If Smart can peak out at 18 and 8 like Chauncey, that'd be great.