My gut reaction on this is either size would work/be the same.....but wanted to ask those who may have actually test ridden this situation for feedback.

I'm in the market for a new road bike and am in between sizes (56/58). Using Velogicfit frame comparison it looks like I can make both sizes work in any brand and the two different sizes could pretty much be set up identical by using different stem lengths and spacers. Am I correct to assume that both bikes should ride pretty much identical?

The Cervelo below is just one example, but I am looking at several different brands and model options.....