How can I make my strat sound like a Les Paul?
Sell it and buy a Les Paul! Seriously, the 2 guitars have a different construction and use different types of woods. Changing the pickups will not transform a strat into a Les Paul (or vice versa). Most pickup replacement manufacturers make a range of pickups from close copies of the vintage originals to hotter variations, which will give your strat a fatter sound. Visit the manufacturers’ web sites to read their pickup descriptions, and find out what pickups your favourite players use to get some ideas.