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Measure them? Measure the top tube length and then the stem and then the bars. Compare.
Are you using same saddle and seatpost? Might also help to run a tape measure from saddle nose to centre of bars because less steep angles might have saddle further back relative to the BB. You might have saddle in diff position or a setback post and combined with longer stem at a different angle, blah blah, could be lots of variables.
in desparate need of opinion: I have been riding 95% fixed over the last 4 years and I'm really comfortable on my bikes (52cm Standert umlaufbahn v3 and a 56cm fuji classic, tt54cm and tt55cm respectively)
Within those 4yrs I've tried buying 2 road/cc bikes that tend to be longer than what I expected based on my current configuration on the fixed.
Why would that be the case, could it be related to the fact that the hoods add a couple cm in front of the handlebars? (have tried shorter stems but same feeling, bike too long)
(bikes in query: Planet X nanolight 54cm 2011 and a Cannondale SuperX 54cm 2016, tt55 and tt55 respectively)
Im 178cm so usually these companies put me in top range of medium bikes, which I suppose should feel smaller rather than bigger, right?