i mean the part that the usb connects to...
the part that sticks in the wall
... which is referred to as the "wall adapter" or "wall wart".
It plugs into the outlet and the USB plugs into it. Right, sounds like you are OK.
The wall wart should have a HIGHER mAh rating than the USB charger that plugs into it.
(if it is lower, the battery will take longer to charge.)
The USB charger should have a LOWER mAh rating than the battery that it is charging.
(if it is higher, the battery (or you) risk being damaged!)
Hope this helps.