The with headers versions are identical boards but have pin headers already soldered in. You will need to cut the pins off or de-solder if you need to remove them. An easy way is to use a set of flush cut snips and clip off all the pins and remove the plastic bits from the bottom side. You will now only have short pieces of pin remaining. Heat one pin at a time from the top side of the board until it's loose, while holding it in your hand above a table. Smack your hand on the bench and the pin and solder is ejected out downward leaving a nice clean hole.