What I have always considered a "matched pair" is two of something that is matched withing reason or all practical purposes.
It is unreasonable to expect perfectly matched pairs
In an integrated circuit - where you can get good matching - to do so means having the transistors adjacent to each other and the same orientation. Transistors on the far side of the chip in a different orientation won't match well at all. I suppose if you had two RF power transistors that were adjacent on the wafer, you would get very good matching, although you would have problems identifying them. So as 'AXW says, it's 'matched within reason or for all practical purposes'.