If we take a 2-input NAND or a 2-input NOR gate and tie the inputs together to a single input line in both cases, determine using a truth table how both type of gates would behave (i.e. is it like a different type of gate)? Using only the same NAND or NOR gate, examine the truth table for both gates and determine how could we get an equivalent behaviour using a different wiring configuration on the input side for both NAND and NOR gates?
So, what happens when the inputs are the same value? In the time you took to post this, you could have figured this out. If you don't know the behavior of NAND and NOR gates, then that is a different question. Please attempt your own homework before asking others to do it for you.
Similarly this is a question given to students on the first class of Introduction to Digital Logic. You should be able to answer the question on your own.
Okay, so now that we know the question that was asked of YOU, what is YOUR question to us? You need to show your best effort to answer your problem. We can then use that as a starting point to see what you have right and where you seem to be getting stuck.