I'll go into a bit more detail regarding the two lenses.
SEL16F28
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-Wide Angle 16mm
-F2.8 Aperture (Better for Low Light)
-Small and Portable
-For shooting landscapes, architecture, groups of people
-For shooting in close and cramped places
-Able to use VCL-ECU1 Ultra Wide Angle Adapter (12mm)
-Able to use VCL-ECF1 Fish Eye Adapter (Fish Eye Effect)
SEL1855
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-18mm to 55mm Zoom Lens
-F3.5-F5.6 Aperture (F3.5 at 18mm, gradually increasing as you zoom out to F5.6 at 55mm)
-Larger, not pocketable
-Multipurpose use, from close-ups to wide angles to medium distance shots
-More distortions at Wide and Tele ends (most Zoom lens suffer from this)
On identifying Ori and AP, I suppose looking for the Sony Malaysia sticker and scratch label is enough? I'm not too sure on this, maybe other members can enlighten us on this.