ALL YB PISTONS 2WD AND 4WD HAVE OFFSET WRIST PIN, the difference is 4wd have more offset, it's not detrimental in any way other than annoying some people, if it doesn't go away when warm then you have a little wear, but will still go for miles, mine had piston slap when hot, but still managed 200,973 miles before it was taken apart, compression was fine, as was mpg, and emissions, it did 40+ mpg without especially trying, emissions were 0.97% CO, 137PPM, with 190,000+ on it.
The oil rings went like overnight almost, and started drinking oil at 1L every 10-15miles, hardly smoked at all though.
The 2wd degree of offset hasn't been used for years, I'd be seriously amazed if it was still used, the reason for the offset is the thrust of the piston as it is pushed down the bore it tries to rock, the offset is to counter this.
4wd yb were reworked in several ways, one way was more offset to the wrist pin, hence less noise.
tabetha