Peuerbach, Austria, Notgeld error [gelöst]

I've been entering several hundred German and Austria Notgeld into Numista and found no major errors until now. For Peuerbach, Austria, I have a note with an obverse matching a couple of 10 Heller notes on Colnect but in different colors. The color I have is red brown though it does not show up well in my scan. On Colnect there is also a purple 20 Heller with only the denomination being different from the 10 Heller design.

Here is a link to the Colnect page showing obverses and reverses. My note is 10 Heller on the obverse and 20 Heller on the reverse. Is this a known error as far as anyone knows? I have no Notgeld catalogue to check. Is it likely to be desirable? I think it would be best to add as a variant to an entry for the 10 Heller note (but it is not in Numista yet). If I add it, is it OK to just add the obverse photo and then add the reverse photo in the overall Comments section?

Here are my scans:

All comments welcome.

Will

Have you communicated with the refs for Austrian and German notgeld? They are very knowledgeable and have good insight in these matters...

Thanks Oklahoman, Refs contacted, new to alamir's experience and he suggested just adding it as regular note with 20 Heller reverse as known variant.