That's not a great comparison.
There are two types of concept cars that eventually make "production". The first are visual concepts only, designed to give a flavour of what the eventual production car may one day look similar to.
The other type - that Lexus (indeed, many Lexus concepts) being one, is where the production car's styling (and probably many other attributes) is already set in stone, and the "concept" is more like a slightly jazzed-up production car to stir up press shortly ahead of launch.
BMW does this a lot. Remember this?
That's the 2007 BMW M3 Concept. No, really, it's not the production car. I mean, it is, but technically it's the concept and probably didn't move under its own steam. The Range Rover LRX (later the Evoque) was similar, as was the original Audi TT concept, which basically just gained a couple of quarter windows for production.
The original Porsche Boxster Concept was rather different - more like the Supra. The concept had the look and feel of the production car, but it was a true concept - the production car was significantly toned down and had to work with proportions dictated by production constraints and tooling. So it went from this sleek, 550 Spyder-esque thing:
...to the slightly dumpy production car we actually got. You can obviously see the visual similarities (as you can with the FT-1 against the production Supra) but the end result was necessarily toned down. And it's very different from the way something like the Lexus LC was revealed as a "concept".
The bottom line is that it's not always possible for manufacturers to simply put a "concept" into production. If a production car looks like its concept, that's generally because the company basically turned a production car
into a concept with some fancy trim so they could show it off at an auto show.
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