Better pickups, if properly matched and installed correctly, can make your guitar sound better. Many players upgrade their pickups to improve the sound of their stock guitar. Certainly putting in the same or similar pups as the higher end model should help your sound considerably, as long as they are electrically and mechanically compatible. (Not a certainty.)
Will it sound as good as the high end model? Probably not, because other factors besides the pickups go into making a guitar's sound. The internal electrical components may be of better quality on the high ender and numerous other things might be different: Quality of the wood, method of construction, nut material, bridge construction - any number of aspects that can impact your sound. (Things like 'tone woods' in the body, fingerboard woods, and nut material are sources of endless debate among musicians playing electric instruments: Some believe they make no difference in an electric, others will pay considerably more for a guitar body or neck made of a particular type of wood...)
That being said, along with the strings and your own technique, the pickups are the most important link in your sound chain (we'll leave out the amp and speakers which are completely external) so if you get the same pickups as the high ender (or any better pickups that are suitable for you and your guitar) and make sure that they are installed properly (very important) you should hear a significant improvement in your sound.
More than that, sometimes there really is very little difference between a high end model and a lower model outside of the pickups, for example. You often pay more just for cosmetic differences - a nicer paint job, pearl inlays instead of plastic, a natural bone nut instead of synthetic bone (etc etc etc).
Also having "the bona-fide signature model" or a "Made in Japan" or "Made in America" model instead of "Made in Indonesia" model will jack up the price, although objectively speaking the "Made in Indonesia" or "Junior Model" might be just as good.
All such factors generally have little or no effect on the sound and playability of the instrument itself (outside of the player's mind - people like to think that if they paid more, it sounds better...).
Unfortunately, it's not always easy to find out the truth about the differences: The makers, the dealers and those who buy the expensive models all have an interest in keep those matters secret. Ibanez and their vendors certainly don't want people to know that they're paying double for the "high end model" because they're getting pickups worth another $100, mother of pearl inlays instead of plastic, and the labor is more expensive someplace, while the instrument itself is virtually the same!
I know bass players who will buy a Fender Squire bass for $300, change the pickups and the wiring or pre-amp and they claim that it sounds as good as the $1500 American made model.
Try to do some research about others who have done what you want to do. It's probably a very good idea - well worth it. But unless you are familiar with guitar electronics, etc. you might want to have a guitar tech install them, or at least get some advice from one.