What is difference between different type of mean?

This question is redundant. Meaning that it is not necessary to used difference and different in the same sentence. If someone asked "What is the difference between these pencils?" you would need to identify the characteristics that separate one from the other. For example, one pencil may be yellow and another pencil may be green. An example of different types of pencils would be #2 pencils and mechanical pencils that use refillable lead.