Grass, just comparing the N you would have to use about a half lb. more of the 25% Nitrogen product /1000 sq ft. to get the same N rate/1000. Overall if you want the P and K the 25 is the better bang for your NPK buck.
Just seen my typos! I was referring to the 24-5-11 product. It would take a 1/2 lb. more of the 24-5-11 at the .75N/1000 amount to equal the N of the other. Sorry about that!