No-one would be able to tell the difference because even the law of reality is deceived by the person.
It is to the extent where even the abilities and capabilities of the person you transformed into would be yours for the taking.
This was how Ryuk and Tatiana were able to stay amongst humans in Zion Empire for so long until they slipped up that is.
Of course, the downside was that for a human transformation, the person you are transforming into would have to be dead else Reality would attempt to correct the anomaly of two people being exactly the same by removing one which could be either you or the other person.
So the chances of dying or killing someone was quite high.
Now Max did same but with a few adjustments.
As he knew that Veil perfectly copied the appearance, he decided not to copy all the characteristics of the yeti he just murdered.
Instead he opted to do away with the corruption, returning it's appearance to the time before the corruption.
