That would likely be more the retained lipids. Does your poo float well? If so, that’s likely the cause.

Acrolin (spelling may be wrong, I’m too tired too look it up lol) is the main chemical you smell from over heated oils. There’s also several types of aldehydes made as a byproduct of digesting fats, and they’ll tend to be more present when the fats didn’t get totally broken down.

But that’s usually something you smell more in poop than flatus. What you’re smelling in the gas is most likely traces akin to the levels of things like cadaverine that aren’t a main component produced as a gas the way hydrogen sulfide is.

That’s best guess.

If your poo is floating most of the time, and you’re smelling that distinct fried food aroma, might want to cut back on your fat intake a little. Or switch more to polyunsaturated fats at least. It’s okay if poo floats sometimes, but it should be either neutral buoyant, or sinking most of the time. If there’s enough fat that it floats regularly, that’s almost always a sign that you’re taking in too much, too often. Polyunsaturated fats won’t change that, but at least they’re a teeny bit less problematic healthwise (as of current best practices I’m aware of).

If it’s not floating, or the smell isn’t coming along with fatty foods, get your gall bladder checked just to be extra, extra safe. Something like half the people I’ve known that ended up having theirs removed had issues with their poo looking and smelling funny, often with higher fat levels and unusual smelling gas. Not saying it’s some kind of “oh my god” thing, it’s just being super cautious.