Most of the time I've seen wild hogs they look like this,
Kind of the cross between a domestic and wild... "Pineywood Rooters" as my dad calls them.
lately in the group's we've been seeing, a few of them seem to have the narrower rear end, and a broad chest, and spikey hair....They look more like those European boars they hunt over there.. They look like the Arkansas Razorback pig.
I've set my trail cam out to see if I can get some pics of them.
I've always thought those tend to be more aggressive than the half domestic....true?

I've been seeing a lot of those European looking ones too. With the bigger chest and tiny butt. Their heads seem bigger and more pasture damage too.

Where I hunt in Junction only the mature boars get that Euro look, the rest look more like the picture above. But the big old boars have the razorback and the heavy chest and even their gait is different.

Pigs are an extremely plastic species phenotypically. Keep in mind that all of the pigs we see in the wild here are historically Eurpoean/Eurasian in origin and carry virtually all the genetics from them. Breeding has brought out other traits as being more dominant, but genetically, they are ~99+% the same. Domestic hogs are actually a bit more genetically diverse than their wild counterparts, but retain much or most of their wild counterpart's ability to express "wild" traits.

https://phys.org/news/2015-09-modern-pigs-wild-boar-genes.html
https://nri.tamu.edu/blog/2018/january/the-origin-of-the-wild-pig-species/

Check out the hybrid section here...
https://www.intechopen.com/books/animal-domestication/a-genomics-perspective-on-pig-domestication

The feral hogs that resemble European wild boar do so because A. they've cross-bred with European boar that have escaped from game preserves and B. they've been in the wild for many generations with admixture from recently escaped domestic pigs, and so have re-evolved ancestral, wild boar-like traits (longer snouts, broader shoulders, humped back, narrow waist).

Given all of the exotic game ranches in Texas, it wouldn't surprise me if our feral hogs are cross-breeding with European boar occasionally, though I'm not sure how many pig farms there are whose escapees contribute to the blood lines.