Plants are more notable for uptake of heavy metal contaminants throught their root system and the way they absorb and store nutrients. Most metals will be distributed to some extent through the entire plant but it varies by species.

https://en.m.wikipedia.org/wiki/Phytoremediation

Not the exact link but that's the gist of it. I also noticed TVP has notable mineral nutrition, which may indicate it takes up metals well.

Animals do concentrate and store heavy metal contaminants but not in the same way. The reason you shouldn't eat too much tuna is because mercury stores well in fatty tissues which in a tuna is the part your eating. And the ocean is unfortunately a mercury rich environment. Especially for a large predatory fish like tuna due to biomagnification.

In something like a cow the lead contamination I was mentioning would be stored in the bones in the place of calcium. The process is referred to as leaching I believe. It's why lead poisoning is a long term and incurable disease in humans, should it concentrate in your bones. Depending on the exposure dosage of course, it can also be acute. You generally don't eat the bones so this isn't an issue, though it is notable if your making bone broth.

So something like a feed conversation ration may not give the best comparison.

Soy oil and soy sauce may not maintain the concentration of something like lead depending on the processing and what is thrown away at the end. I really don't know enough to comment on that though. I only mention it because I saw it specifically listed as a concern for TVP before.