The ships in that version of the 26th century were likely designed to work and fight in the Expanse. There would no longer be a reason to design ships with that in mind. The Enterprise-J without Sphere Builder influence could be radically different.
Since the Enterprise-J existed in a parallel universe where the Expanse grew from the 22nd century to encompass the huge amount of space it did by the 26th, I would assume that every version of the Enterprise from the Ent-Nil to the Ent-J would have looked quite different than the prime universe versions. Because the Ent-J shares many similarities to the NX-01's design, I would also assume that all the other Enterprises in between did as well, which the Prime universe's Ents-Nil through E did not.