I wouldn't presume too much. I just ordered short on the first TT bike on principle, then when I had the shop move the powermeter off the old tt bike to the road bike (newer meter, moving to standard rings) I didn't even think of the crank length until I got on it and my saddle felt low.

I worried about it for half a second, then remembered I have no sprint anyway so max torque isn't my concern, and I spend plenty of time off the front trying to merckx tt it anyhow so the extra .00005 degrees of hip angle when I'm trying to stay low is fine.