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@gbj_tester
You do know you're asking for an #internetbikefit, don't you?
With that in mind, I ride a Large (55cm) Look 585 and a Small (51cm) Cervelo T3, the respective reaches are 406mm, and 405mm, but I use the same saddle setback on my road and TT bikes.
Not sure where I am with stack, the Cervelo headtube is 66mm shorter and has a slammed -17°×100mm stem +60mm stack under the extensions, the Look has about 23mm of spacers and a -10°×°110mm stem.I think taking that all together the low point in the curve of my elbow cups is about 40mm below the top of my road bars, and the back edge of the cups ends up about 20mm behind the centreline of my road bars. Oh, and Pro Round bend bars, 80mm reach × 130mm drop, FWIW.
Of course, none of this is likely to help you, especially if you're thinking of sitting in a different position relative to your road bike, which makes it your fault for even asking :-)
Since you're already on a small road frame, it's very unlikely that whatever ordinary road/track frame (as opposed to specialised TT/Tri/Pursuit frames) you buy is going to be too small, so I'd suggest getting the 50cm if you've decide on a PreCursa, maybe even a 45cm