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@edscoble
I found this diagram that hopefully help you understood the difference in seat tube angle can make despite having identical sized frame;
http://i256.photobucket.com/albums/hh167/edscoble/Photobucket%20Desktop%20-%20Edward%20Scobles%20MacBook%20Pro/6326849846_eba5a1c0da_b_zpsc904dc7c.jpg
TL:DR; steeper seat tube mean saddle set back further increasing top tube length, slacker seat tube mean saddle set forward shorten the reach (while all have the same distance from saddle to bottom bracket).