I'm designing a website for a client who has provided his company colours as Purple PMS 2607, and Grey PMS 428. I don't know much about pantone colours or really use them at all and so I'm looking up examples of the first colour on various websites and the colour seems to vary a bit from site to site. And in xara I see there are different colours named 2607 but with pc, ec, u, m after them and none of them really match the online examples. I can go with a colour I feel is close but I'm wondering if there's a way to match the colour for use on a website?