Grey vs Red cleats for Look Keo Pedals?

I have the grey cleats for my Look Keo pedals, which are what came with the pedals when I bought them. I need a new pair of cleats as the left one has gotten rather worn (I always unclip with my left and when I was first learning, I'd touch down a few times before stopping completely and sometimes I still have to). But I can't seem to find the grey ones anywhere. I'd order them, but I'm going riding this weekend, so they won't be here in time. I will check the LBS, but in case they do not have them, I may have to get the red ones. Is there is a noticeable difference in the two? According to the package, the grey has 4.5 degrees of float and the red has 9. I don't like a whole ton of float - could I just compensate by adjusting the tension on the pedal?? Or won't it be that different in the first place?