All aircraft are certified to be able to land at max takeoff weight with a sink rate of 330 fpm and suffer no damage. Max landing weight requires that to be 660 fmp and no damage.
Often the overweight landing check will just be a download of the FDR to verify impact descent rate and a visual check. Should you exceede 330 on the overweight landing, well then it gets a little more expensive. Also overweight landing procedures may have you turn off the bleeds as well to make sure that you have the engine out go around power necesary....
If you need to return do it and don't even think about the overweight landing other than complying with the procedures in the book for it. If company says you need to return, well just fly around for a while and take in the sights!
Cheers
Wino