Alright! I have emailed the manufacturer to clarify.
Will get back to you when I have an answer from them.
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Here is the answer I got from the manufacturer:
Yes Heatit Z-TRM2 & Z-TRM2FX does have the same identifier.
Heatit Z-TRM2 is withdrawn from the market, so there is no reason to have an integration on this Identifier made for the Z-TRM2.
Heatit Z-TRM2FX is our official thermostat now, and it is this that should be used for integrations etc.
I believe 2.9 was the last firmware for that thermostat yes. But this is not supported by us anymore.
Tho, I read in another forum post that there might have been a firmware Version 2.11 as well…
Anyway! Everything seem correct in the database. And now that I think about it, after many fresh installs of openHabian, I might have forgotten to properly update the system (and maybe the binding). So I will have a go updating everything first before we spend even more time on this… Hopfully this is all just a embarrassing rookie mistake 
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Yep! thats it, I had to update the zwave binding to 2.5.0 snapshot. 
@chris and @Bruce_Osborne sorry for wasting your time!
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