OK, well, I am not so technical, but from my ignorant standpoint, both the seat tube and head tube on the Guru are taller than on my carbon bike, which is because on the carbon bike, they were essentially making the bike fit me, if that makes sense. I have hardly any stem showing on the carbon bike, and on the Guru, it looks, well, normal. I have my bars exactly even with my saddle on my carbon bike. They are a little above the saddle on the Guru, which I need to change. When I had the fitting (very extensive, on the Guru fitting system), he started out with it very upright; I kept saying "no, lower," until it felt OK. Then, after the bike arrived, I still had him change the position, based on being on the trainer. I think the fact that I said this bike is going to be used for long, hilly rides on tours/trips and my age made him want to put me more upright, but we compromised.
One of my issues is that while my Kuota may not be exactly right for me, I am used to it. I have a lot of issues with changing to anything new and I am not particularly adept at handling these changes, despite years of riding. In fact, what really made me want a custom bike with couplers was my experience with my rented Orbea in Spain, on a tour. It was a 48 cm unisex frame, with a triple, just like my Kuota, but the bars were too wide and it didn't have the short reach brifters. I could barely ride the thing and it caused quite a lot of anxiety the first 2 days. On previous tours, I either had my own bike or a Trek Madone exactly like the one I had.
My first 10-15 or so rides on the Guru were hell, starting with just starting off to get on the saddle. I definitely have to push myself up higher to get on the saddle (realized that after the first ride when I alost impaled myself by catching my shorts and bum on the saddle), as the bike just feels "higher up" and bigger, even though it fits perfectly. It is the different geometry that felt weird to me, if this makes sense, and I don't do well with differences. I found myself shaking and often feeling like I was having difficulty keeping a straight line in the beginning of rides. But, one day it just "clicked," and as long I remember that I have to think about getting on the saddle and pushing off, I absolutely love the feel of this bike. If you put my 2 bikes next to each other, the Kuota looks little compared the Guru, but both fit me.