Deer ranging capability - Wildgame Innovations Halo Ballistix Laser Range Finder w/ Angle Intelligence

I received the above 900 range finder. I have a 600yd of same brand.
What I don't understand is the specs for my 2yr old 600 range finder works on deer out to 300yds, but the 900 lists the same specs so what exactly did I gain by purchasing the 900. I thought I would be able to range deer further, yet every on both factory shipping pkgs states the exact same specs other than the model 600 and 900.
Other wise the product is great as is my older model but I spent more money and gained nothing.
I wanted to range game further, not a tin roof.