The mAh is not a problem, it's the 7.4 volts that could possibly blow things like capacitors in circuit boards.
In my experience one problem is that genuine Sony batteries all have a micro chip in them that, among other things, tells the camera the percentage of charge remaining. The camera may or may not detect that it is using a counterfeit battery and could refuse to start.
What is certain is that if you use a battery grip it will not work if you use a counterfeit battery in #2 position. Other than that I have never had a problem with any counterfeit batteries that match the voltage of a genuine Sony battery. You may not get very good charging rates with them, as John says, "it can become a bit of a lottery".
To my knowledge all A mount Sony cameras use 7.2Volt, 1600mAh NP-FM500H batteries. I have never used an A330 so cannot be absolutely certain what it uses.
Sony A7, A850, A77, A700 || Sony>> 70-300G, 28-75 f2.8 SAM, 16-80CZ, 50 f1.4, FE 28-70 OSS, FE 24-70CZ f4 OSS, LA-EA4 || Minolta>> 300 f4 G HS, 200 f2.8 G HS, 100 f2.8 (D) Macro, 50 f1.7, 28 f2.8, 28-135 f4-4.5, 70-210 f4, 500 f8 Reflex, TC x 1.4 HS, TC x 2 HS. || Sigma 21-35 f3.5-4.2. || Tamron SP 24-135.