I think it's hard to compare them since they're completely different cuts, but I pulled up the measurements for both sizes at JCPenney (they were the first store I could think of that had both)
14W
Bust - 39 1/2" - 41"
Waist - 32 1/2" - 34"
Hips 42 - 43 1/2"
16 Regular
Bust - 40 1/2 - 41 1/2"
Waist - 32 1/2" - 33 1/2"
Hips - 43 - 44"
