First frame number of image sequence?

Does the first frame number of an image sequence used in Mocha have to be numbered as 0? I think I read somewhere it can’t be 1? e.g. image_000 NOT image_001

Does it matter?

It shouldn’t matter what frame it starts with as long as the rest of your elements you are trying to match to the scene match the frame range/speed/aspect ratio of your tracked footage.