When they arrive, they're not refugees; they're asylum seekers and they're refugee claimants. However, we do no lists from the boats. If someone arrives in a group, we cannot make any assumption about the merits of their claim, whether or not there's a greater or lesser possibility that they're a refugee.
To give you a contrast, when the first boat arrived from Sri Lanka, the acceptance rate for Sri Lankan claimants was 76%. Ten years earlier, with the four boats from the People's Republic of China, the acceptance rate was less than 5%.
We can't draw conclusions just because it's a group arrival. Also, we can't draw any inference that it is an increased threat to Canada one way or the other because they're in a group. It is not a security threat.
What is the difference? The only difference, quite frankly, is that the person who arrived with fraudulent documents and manages to get through Vancouver International Airport probably had more money and was able to buy better quality documents to get to Canada.
In terms of threats to Canada, in terms of the merits of the claim, there is no difference.