Just in case someone also wants to do this I will write how to do.
Using edge was not the way, this led to a lot of problems and neither of the two versions was stable.
Then I found a hint in the internet. You have to add the repo twice.
One time as:
http://…
and the second time as:
http://…/
Both strings are different, so home assistant adds them.
Now you have zigbee2mqtt twice on the addon install page. You install both and configure only the first.
Change the mqqt topic, the zigbee id (both, the upper value and also the numerical value) and the zigbee channel. Now you can start the first z2m. After this you configure the second z2m and you can also start it.
This way you have two z2m links on the left menu and both instances work perfectly.
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