As far as I know/have found you can use any pad on a used disc - so swap around to suit your needs, it's a 15 minute job...with the exception of ceramic based stuff , unless you're prepared to deal with 100 miles or so worth of judder whilst it scrapes the old build up off. I learnt this the hard way - you're supposed to scuff up the discs with garnet paper, at least.
The RC6s are the easiest in terms of 'fit em and go' pad around, fully sintered FTW - but they squeal like a pig unless you back them with 3M anti vibration tape and they'll kill soft discs... that's race pads for you.
Mr Casey went well, Dave.