40 vs 80 Fixture limits inconsistent info

Hello, have been reviewing the CS offline in order to recommend what unit to use for a school. The question I have is on the ETC site it states that all the CS 20 or 40 f as er versions allow up to 80 fixtures. However on vendor sites and in the latest FullCompass catalog it says the CS 20’s allow 40 fixtures and the 40’s allow 80 fixtures? What is true?

Also, wondering how people deal with “Grouping” fixtures (ie EOS style) and/or assign groups of fixtures to submasters?

 Thanks in advance.

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