The short answer: No. PowerPC isn't 100% compatible with 68k. Coldfire is only partly compatible to 68k and also has some powerpc instruction if I 'm not mistaken. 'Only partly compatible means missing some instructions which were there on the 68k. But form this point of view a 68060 misses one or to instuctions too...
That's why you've got to implement a emulator for older software. And then you get to the point where one can say: "if you emulate anyway, why don't grab a cheap powerfull x86".