The cannondale has a full size longer reach and would require a 10mm shorter stem. No one has mentioned stem angle. As long as integrated bars aren't used, flipping a -6 stem to +6 will add about 20mm to the bar height. A flipped stem is preferable to another 20mm of spacers. I'd want to know your saddle height and body height. Your goal should be to improve fitness and not need such a high bar height. The bars shouldn't need to be higher than the saddle, but I've seen it done.
I'm 69 years old, 168cm tall, with an above average 72-73cm saddle height. I use a 10cm saddle to bar drop, so a total stack of 525mm, with headset top cover and 10mm of spacer works with a -7 stem on integrated handlebars. Frame stack is 505mm. I've been riding a very long time, but took 8 years off to do other things. I came back to it over 4 years ago with new knees and didn't need to change my fit. Over 21,000 more miles logged, with lots of climbing.