I've noticed that many track bikes fit smaller than their top tube seems to indicate. Like i usually ride 56 ett bikes on the road and do a similar
fit for road or track, but for a 56 track bike to fit I have to use lots of spacers and a long stem 130+. So if you can, compare the reach and stack to see what you would actually need, not just ett. Also what bars you plan on running can make a huge difference.