[Amps] 'red' cores versus 43 cores

[Dan Sawyer]

Is there a straightforward practical or operational description of the 
difference between 'red' cores and 43 material. The magnetic differences 
are large. However, the 'red' cores are used in low power mixers and the 
43 cores are used in rf power transformers for similar frequency ranges.

What would happen if a mixer were made from a 43 core?
What would happen is an output transformer were made from 'red' cores?

Thanks Dan kb0qil