still hard to tell with those numbers because they describe the technology but not the actually part number. The problem here is that there are certain sticks with the numbers 4a in them that are Guaranteed compatible with that board, however if they have 4x in the part number neither corsair nor asus lists them as compatible. And both sticks would have the same specs as the ones you listed
It is unlikely the board wouldn't post if you have the 4x models i'm guessing but at the very least you would likely have problems.
**ok, well where did you buy the memory? new egg perhaps? if you bought online anywhere you might have a receipt in your email, it will list the model/part number on this receipt.