It will look at the most restrictive of the 2 options. Since both allow 4 you can have 4 copies total.
Hm. This is interesting.
I would have thought that it looks at the card as a whole. In this case, it is still a single brigade and you could have 4 copies.
But for Fifth Seal/Justice Seekers, if it looks at the most restrictive of the two options, both options are two brigades, so you could have two. However, the card as a whole would only allow one copy because it includes 3 different brigades on the card.
Can you have 2 copies of Fifth Seal in a T2 Deck?