There are three rules for the co-op PODs online.

FFG has no official errata for these rules but there are a few very small changes and clarifications.

Has anyone tried to summerize these changes ?

e.g.
1.) pt 4 Hero Phase, "during each round" instead of "at the start of each round"

2.) pt 6 Loot, "this is done in addition" instead of "this is done before"

3.) pt 11 Spawn Section

more ?

I'm not sure which changes you're talking about other than those in the FAQ. Which 3 rules are you referring to?

Edit: Do you mean differences between the different coop adventures?

yes, i'm talking about the three coop adventures (forgotten souls...).

There are little differences in the core rules.