Many examples like this, particularly when the original version is a bit obscure - Tainted Love mentioned earlier, which apart from Northern Soul afficionados was pretty much unknown before Soft Cell, I Will Always Love You was pretty much unknown as a Dolly Parton hit (at least here in the UK) before Whitney. So I would say Deep Purple is 'right' and Kula Shaker 'wrong', and the others don't count. But that's purely MY objective opinion.