My source:
https://www.displayninja.com/new-monitors-in-2019/
Wont be only one version of this panel, if LG havent changed their mind.
This is what displayninja actually said about a hypothetical FreeSync + DisplayHDR 600 variant:
There will likely be a FreeSync model of this monitor which would fit (spec-wise) the previously mentioned 38″ Nano IPS panel with DisplayHDR 600.
In regard to HDR:
Note that they don't actually say it will support DisplayHDR 600. They simply point to another panel with a DisplayHDR 600 rating and then mistakenly surmise that the 38GL950G's panel will have similar enough specs to achieve the same. That's speculation and very poor speculation at that. Why? For instance, in the paragraph preceeding it, displayninja states the following:
LG announced the LG 38GL950G ... with a peak brightness of 450-nits
As you correctly implied, two monitors being variants of each other mean they use the same panel. The panel determines peak brightness. However, a panel with 450 nits peak brightness can't achieve a VESA DisplayHDR 600 rating. Displayninja contradicts itself within two paragraphs. Either the FreeSync variant isn't a real variant because it uses a different panel (highly unlikley), or neither variant will support DisplayHDR 600 due to an insufficiently bright backlight (far more likely).
In regard to the FreeSync variant:
I'd say you've misquoted. They speculated that "there will
likely be a FreeSync model", which is entirely different from you saying "there
won't be only one version of this panel".
Even if you had accurately quoted them, I'd still consider it meaningless, as the folks at displayninja are just a bunch of plagiarizing technical know-nothings who shouldn't be considered a trustworthy source for anything. Compare that to some of the really good sites like PCmonitors, TFTCentral or Anandtech and I'm sure you'll notice what I mean. Displayninja can rarely get through a single paragraph without making mistakes. In this case there are multiple examples in the exact same paragraph, like this one:
So far, it looks like the LG 38GL950G won’t feature HDR as NVIDIA has more demanding requirements for G-SYNC HDR
It's difficult to sufficiently twist the meanings of those words so as to arrive at a sentence we might consider accurate. Whatever displayninja wanted to say, I'm pretty sure monitors like the XB273K, which combine G-SYNC and DisplayHDR 400, prove that nVidia doesn't have "more demanding requirements" for HDR than anyone else does. Most would argue that DisplayHDR 400 is such a low bar that marketing it as HDR should be illegal to begin with.
In summary, all we have here is misinformation and some speculation. I don't think that counts for anything really. Most importantly, none of it speaks to the issues I raised in regard to this monitor being G-SYNC vs FreeSync/G-SYNC Compatible.
I'm not attacking you with any of this. You simply misquoted, which isn't a big deal. If I'm pointing a finger at anyone it's displayninja.