The imperforated stamps are printed in a limited number (but no more information).
There is a difference though between the imperforated version of any french issued stamp and the same stamp printed in color strips of five stamps. These are also known if full sheets, and have probably been issued in many colors (no more information).
Singe stamps in pair with top right corner:
Seven different color imperforated stamp versions (which are different than the ones of the 5 stripe imperforated stamp set - see below):
A vertical set of five colored imperforated stamp serie: