I read that approx. 99% of bourbon is made in Kentucky.
Some say that the water used in Kentucky makes the biggest difference.
Now, you can use the same method, and ingredients, and it will be mighty close, but true afficianados (or snobs) would beg to differ.
I’m in Denver today, and they make a very good Colorado Whiskey here, but I don’t think they would dare call it
“Bourbon”.
For me, I will have to “research” the subject in more depth
(of the glass).