Er i wouldnt really say a difference tbh. My young female was amazing at litter training before, not a single poo anywhere other than her litter box! And is the same now.
One of my rabbits was great at weeing both before and after in her box, but poos more scattered even afterwards. And another of my females refuses to be litter trained before and after, shes taken to changing her wee area every day now too!
My male i saw a difference with, he wee'd in his box before and did a few poos, but most poos in his cage, now the majority of his poos are in his box too, but he does have a few elsewhere