As far as we all are concerned (those of use with no access to those accts with no published public keys) they are the same scenario and are subject to cracking.
Ive already reached out to counterra and asked them to look into curve25519 performance of their terraminer IV 2THps sha256 asics
I don't know how these nxt accounts are being secured, but a sha256 asic is going to have a performance of 0 for curve25519...