Yes they may very well be in more trouble with their Creator than had they eaten some pork. Mind you in this situation, where they did so unknowingly it is not even a sin. But given the laws of the land, it still was a violation of human rights. This is not some Khmer Rouge type prison where Muslims were made to eat pork as a penalty!
Besides were they in there for murder and rape, as according to their faith, they should get the death penalty not kept alive fed pork contaminated meals in jail!