If I remember rightly I've seen two types of cards.
With one of my zeds, which I've now sold, the mounting points for the clips had a groove cut into them which would allow you to slide clips in and out making it very easy to replace the clips.
On my own zed I don't have these cut outs meaning that swapping clips is a pita.
Could never work out if someone had cut the groove to allow for easier clip removal in the other door cards I have.
I just use a duck nose plier and pull vertically making the pull very quick so that I don't rip the mounting point off.
It's common for the clips to break on removal so get a set of spare ones, very cheap on ebay.
Mounting points for the clips are also easy to rip off so have some plastic weld to hand in case it happens.