Yes, the charging input is the same but the phone form is different and it may not work as you would like.
Can you send us the model number, build ID, lot number, manufacturing date, and where you bought it from? Once you do, we will look into it and let you know what we know.
I don't think I have the box I had it when I had my ipod then used it for my iphone so it's quite an older model. If I need to upgrade it I an do that for the iphone 4!