Why do people make all these comparisons that can't really be compared?
4000 years ago, they had technology that was essentially superior to that from 4000 years in the future. They had personal stealth generators, thermal detonators, disruptors, and touchscreens. Some of these already existed in the original trilogy, but they still hadn't perfected cloaking devices for small ships, nor invented touchscreens in the future. This kind of argument is a paradox of future technology being inferior to past technology because the KOTOR era was created after the original trilogy era.
I would say that there are a very wide range of possibilities when you say 'yes,' but that 'no' means that there are 4000 year's worth of ships that can't rival Executor in their prime.