iPod 4th Gen 40GB and 20GB have the same spare parts?

iPod 4th Gen 40GB and 20GB have the same spare parts?
I need to replace my earphone jack for my ipod 4th gen 20GB, The available spare part is for 40GB. can i use the Earphone jack for 40GB to my 20GB iPod 4th gen?

ANSWERS:

It wont interchange on mine. The connector to the logic board is different on mine. You might resolve that by using the current ribbon cable coming from the head phone / hold switch. It physically is the same and does fit.