Originally Posted by
urbanknight
Actually, since HTA and STA are usually within a few degrees of each other, it won't tell you much other than how high the handlebars will be with the same number of spacers and the same rise of stem.
Incorrect, that is a very simplistic way of looking at it. It is critical to reach when comparing frames. Reach is measured from the centre of the bottom bracket not the seat tube. Draw it out and you will see. It is possible to have two frames with the same horizontal top tube length and different reach due to head tube length.
OP There is a lack of info to get really accurate however making some reasonable assumptions i suspect you will get a very smilar fit by using the stem flipped up similar to your cannondale, 15mm of spacers under it and a 100mm stem instead of 110.
The seat tubes are different angles which complicates things but assuming you align your knee over the pedal the same way on both bikes then the above will get you very close to your current position