My experience with Fusions and Deep Curls is that while they hold together, they also expand widely, which limits penetration. Haven't done a side-by-side test, but would guess they won't penetrate as much as a Partition.
Among other kinds of media, I use stacks dry newspaper to test bullet performance on "tough" stuff. It seems to simulate hitting substantial bone more than any other media tried, giving a good idea of comparative penetration for various bullets. Shooting a couple of different bullets side-by-side into the same stack gives a fair idea of comparative penetration and expansion.
