range rover

Quick question for jrl guys, is there a specific cut off where sdd finishes and topix starts. I have both genuine tools but tried to use topix on a 2017 evoque and there wasn't the diag tab. But then my sdd program wouldn't load today. So just wondering if there is a date range rule of thumb???

Got an amplifier gone to ground and blowing its 40a fuse. My question being, if I fit 2nd hand unit will it need programming or will it be plug and play?