Well the first photo looks like it's around 800lbs and less than 8feet in length.
There have been people looking into the photo before too. The few investigations I read about pretty much all ended with the same conclusion: maybe yes, maybe no.
The ranchers that shot the huge pig are known for keeping a tight lip about the game on their property so as to not attract hunters... seems they like to keep it to themselves, and I'm ok with that (if I owned a ranch, I'd like to keep the nicest game wandering around on it to myself too... dead or alive). Besides, if their like most ranchers here in the USA, they probably have enough headaches on their ranch as it is with hunters sneaking around... no need inticing more to show up.