Beatyrest Linden Hills vs. Long Lake?

Is the Beautyrest Linden Hills Plush Firm mattress the same as the Long Lake Plush Firm? If not, which is better? My Solitude Plush Firm Beautyrest is being replaced for one of the above. I am looking for a more comfortable mattress than what I have and am also concerned with some reviews saying that the Recharge line is warm. I am definitely looking for a cool night's sleep. Any help is much appreciated. Thanks.