what gauge are you asking about???, They all will of course measure differant, I don't think the brand matters much, I would think full choke, is full choke no matter the mfg. Same with the others IC, mod etc.
A 12 gauge has a nominal bore of .729". Chokes generally come in .005" restriction increments but some of them are less common (improved modified, light modified, etc.) The most common chokes and nominal restrictions are:
improved cylinder - .010"
modified - .020"
full - .035"
turkey choke - not exactly sure, .050" or more
These will vary somewhat from one manufacturer to another I'm sure but are more or less consistent.