There is indeed a different set of numbers, used for FBI intelligence purposes, than those found in the FBI's National Crime Report, in which Hispanic and Mexican/OTM perpetrators are categorized as *white*.
It doesn't make any difference if that they are white, black, brown, or pink. Most crime is committed by young people.
19-28 commit a lot of crime
29-38 commit less
39-48 even less
The median age in the US is now 37. The median age in Mexico is 25. Then consider that the illegal is likely to be younger than the median age in Mexico.
Because most of the illegals are in the age group that commit a lot crime, we would expect them to commit more crime and be incarcerated more.