I've had a few mini-15s from different years, and I've handled others. Without exception, the minis all said "Mini-CQC15" on the blade. That one does appear to be a mini-15. The scale screw pattern is different on the full-sized 15. It's not just adding one more screw, they're actually in different places on the handle.
My question would be "Is it a real Emerson?" If it is, and it does appear to be, then it's most likely just a mis-marked blade. That happens occasionally with most manufacturers. Just makes it uniquely yours.