I live in Canada and when it comes to book covers as well as editions, it's definitely a mixed bag.
Sometimes we get the UK editions and sometimes we get the US editions, and then there are times we get the Canada editions, it's all very confusing and great. It provides more variety.
The first discworld book I picked up has a rather toned down feel to it, similar to how the Harry Potter books were given an "adult cover" treatment.
I have the one on the right. Cheers.