FL1 Sport Suspension Change

Hi, looking for advice ref my 2005 Freelander 1 Sport. It has the 20mm lower and stiffer suspension which I want to change for standard suspension. Is it possible to fit standard FL1 springs to the existing struts? If not could I get a set of standard FL1 struts with springs to fit?

First you've asked yourself why you want to undo all the development that LR did to make the sport handle so well, let alone devalue the vehicle.
In answer to your question, no. The shocks and springs are different, as are the suspension settings, so you'll need to do the work and then have the alignment set for standard suspension for your engine/ gearbox and HVAC type.