Kirkland Barton single barrel reserve 120 proof (Ksb) vs 1792 Full Proof 125 proof. The first thing you notice is the ksb is a tiny bit darker. Nose: They both have a rich vanilla citrus nose. The ksb has a very tiny astringent smell. Taste: Both are pretty similar in flavor as well. Rich vanilla, pears, tangy, a little baking spice. I would say the 1792 is a touch smoother (even with the higher proof) and the ksb is a little hotter and tiny bit more bitter. These are both great bourbons and obviously from the same distiller. 1792 FP is overall better but also costs $10 to $20 more than the ksb. 1792 FP 4.3/5 and ksb 4.25/5. Close because of taste vs value.