Motor Differences F4R

Hello Everyone. I have been cooking Up a little Project in my head.

I am proud owner of a 3rd Generation 2009 Megane Grandtour Tce 180. I believe The built in motor is the F4R870.

Now I have been wondering where the limits of this machine are. I am Not a big fan of mindlessly tuning the engine without being sure what it can savely take.

Do any of you know, what improvements have been made from this model and the RS? (F4R874 i believe?)

I might be planning to Swap The Motor alltogether or rebuilt it with some parts from the RS Motor.

Help would be greatly appreciated. Thanks Everyone!