I'm having a hard time following the nuances of the thread, so I apologize for any redundant comments. But this park tool chart/guideline is pretty straight forward.

http://www.parktool.com/uploads/file...sitionroad.pdf

The trick, like with all bike fit is to start with the saddle - the position over the BB and height above the BB needs to be exactly the same which requires careful vertical and horizontal measurements. You need to use plumb bobs, levels or both to get them accurate. It can really be fussy. You also need to tweek for stack height of the shoe/pedal combination, which can easily be 1/2+ cm different, which is signficant. Tweeking for the nuances of different saddles is needed if they aren't the same. Tweeking height (if needed, for example, for different pedals, shoes or saddle) can then affect setback, and adjusting setback can in turn affect height. So you have to be careful and go back and forth a little. At some point the changes are so small as to probably be insignificant, but if you are casual about it, they can also be pretty significant in terms of comfort pedaling and also in how they can affect reach to the bars by a cm or so.

But, starting with the saddle, once you get them identically placed, it's pretty simple to adjust reach to the handlebars or brake hoods and saddle/bar drop.

In my (limited) experience, it's impossible to get the same "feel" and fit unless you have the exact same handlebars and levers on both bikes. I have two bikes which measure very close if not identical to each other in where the saddle is in relatinship to the bb. Both use the same saddle. Both have the same reach from the hoods to the saddle nose and saddle/bar drop.

But the bikes feel totally different because the handlebars and shifters are different. Different length stems are needed to get the reach about the same, but the different dimensions of the bars made me decide if I wanted the bikes to be identical in the tops, drops or hoods. I chose hoods. But still, I'm much more comfortable on the hoods on one bike compared to the other because of the subtlties of reach and hand position caused by the way the hoods sit on the bars and the shape of the bars and hoods. Both bikes are rideable, but I definitely prefer one over the other. I've tried tweeking, but have decided that if I want the bikes to be identically comfortable, I'll have to match the levers and bars too.

Hope this helps.