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What stem do you have on your track?
If it's quite short, 8 cm or so you may get away with the longer stem on the cx, but it's it 10 or longer you may end up with a 13 cm stem, which is a tad long perhaps.
Bear in mind on CX you probably sit more upright, but it's something to consider. I cycle a tourer with a 6 cm stem and it's OK as the geo is MTB like, but I believe (help, Ed?) most frames suit between 8-10 cm stems.
For what it's worth I'm 5"5' and I cycle pretty short top tube bikes...51 seems OK. Reach is the big one for me usually. But my bikes are all pre-fancy-geo, bar the Ciocc the seat angles are quite standard and a standard setback saddle does the job.
@edscoble I can go measure stack and reach on them if you want? For funz as they're old frames anymore.
Comparing my old track frame which is a 60 (traditional geo) to a modern cx bike which is 58; the stack of both frames are very close (7mm longer on the cx bike) but the reach is different (30mm shorter on the cx bike). Would the 58 cx bike be the right size or do I need longer reach?