Interesting that the one looks sanded, but the plating looks fine, aside from some probe marks? The other looks virgin, aside from some scratching. Or maybe it was hit with an orbital sander, I don't know...
The marking is interesting... offhand, I have one chip (an SSOP-20 or so) that is painted white, solid with no defects. I also have a uModule with larger printing but does show similar voids in the fill. Seems like, for a small QFN, the marking should be solid, that the voiding only occurs in wider fills or something. Not sure offhand if they ever laser mark them, but it sure seems like they would do a better job of it than that.
Tim