Good continuity is created in ENT: "The Catwalk", where it takes 20 minutes for a cold start of the warp core, which is about the same as in TOS: "The Naked Time".
In "Divergence" , however, Trip accomplishes the same in as few as 2 minutes.
Aside from its look, the technology also needs to work differently and to be less powerful or less versatile.
In particular, this would need to have an impact on the stories.
It would allow (or necessitate) other plot constraints, owing to inferior technology that may not allow standard procedures like an emergency beam-out or a long-range scan over a distance of several light years.