I can tell you right now, that UK copy of Civilization 2 will not ork on a Canadian PSOne.
PAL and NTSC are television standards- the UK and the majority of Europe uses PAL while North America uses NTSC. They also use these titles to say which market games are meant for. The main reason it won't work, however, is region coding on the disc- it will only work on a PSOne made for the UK/ European market.