No they are not compatable Look Keo have more angle than shimano but shimano are firmer fit and wider . its personal choice cost around same.
Keo are lighter than shimano but I had shimano for 4 years before I changed to Keo.
I'll have to get new cleats then. I'll give the Look keo classics a go but i do like my current Shimanos. Just getting a new bike and thought I'd try something different seeing as they're slightly lighter.