No. All that is required is that the tincures are swapped charge for field.
See, for example, the Welsh badge I already showed,
quarterly Or and gules, four lions passant guardant counterchanged
or the arms of Lord Peach " Per fess Or and Azure the Sword of Mercy erect pommel in base Proper between four Stafford Knots all counterchanged"
I was going by the description in Wikipedia. Perhaps I misinterpreted it.
And I’m going by how several actual real arms are blazoned.
Found a new one while doing a jigsaw puzzle today - the town of Brienz, Switzerland:
Per bend sinister wavy Azure and Argent overall a Lion rampant counterchanged langued and vilené Gules
(I would say pizzled not vilené, in an English blazon)
Gotta love heraldic terminology.
So whoever was drawing this up wanted to make sure we knew that was a very rampant lion.
Here’s an image recognition game to play with flags:
The Colleoni family of Bergamo, Italy bore a coat of arms “party per fess, gules and argent, three inverted hearts countercharged”.
“Inverted heart” was a 19th Century euphemism. Their medieval ancestors had blazoned it “three scrotums” or “three pairs of testicles”.
You don’t have the balls to be a Colleoni.
Actually, come to think of it, no one does… 
I was just thinking of this thread the other day, because I passed by a house flying a counterchanged flag. In fact, one of the ones in the OP: The flag of Greenland.
Found one: the emblem of the Israeli city of Yavne (Jamnia):
I am at a loss as to how to blazon it in traditional heraldic jargon, but that’s pretty cool.
Argent, 6 inverted chevronels per pale azure and gules (or perhaps tenne?) below 6 archlets countercharged, below 3 mountains of the second?
It’s a three domes, over a sunrise, over a book. Seriously.
I threw that into ChatGPT for a couple tries and got these:
And I was oh, that’s not quite right. Then I left it there.
But then I came back to the thread later and saw this addition
And went back into ChatGPT. Some back and forth over terms and language, I got this:
A badge: Sable, an open book displayed in base, its leaves formed of arched barrulets issuant from a point in base, dexter Azure and sinister Tenné; above the same, a rising sun composed of concentric demi-annulets counterchanged Tenné and Azure; in chief three domed edifices conjoined, composed of upright pallets and voided of the field, per pale Azure and Tenné; beneath, the Hebrew legend “עיריית יבנה” Azure.
Which when fed back, produced this:
Those images weren’t in front of each other and the sun wasn’t properly counterchanged, so more back and forth, and got this:
A badge Sable: in base an open book displayed and foremost, its leaves formed of concentric arched barrulets issuing from a point in base, dexter Azure and sinister Tenné; behind the book a rising sun of concentric demi-annulets, each per pale Tenné and Azure, the arcs descending to and partly hidden by the upper leaves of the book; behind the sun in chief three domed edifices conjoined, per pale Azure and Tenné, composed of upright pallets voided of the field and prolonged downward to the uppermost arc of the sun; beneath the whole the Hebrew legend “עיריית יבנה” Azure.
which produced this:
Taking out the “a badge” from the prompt produced this:
[Bows]
Your Heraldry-Fu is superior to mine.
Give ChatGPT the credit. I don’t really know beans about heraldry. I had just enough smarts to copy/paste prompts between different parts of the conversation tree to avoid contamination from previous pictures influencing future results.
I mean, it’s sort of appropriately heraldic gibberish your AI buddy eventually came up with, but no actual herald would have produced that city logo - that’s definitely the work of a graphic designer.
True, but it was a fun game to try to get as close as I could using a traditional blazon.
Something looking a bit more period-appropriate without all the thin lines:
A badge Sable: in base an open book displayed and foremost, pages dexter Azure and sinister Tenné; behind the book a rising sun, dexter Tenné and sinister Azure, descending to and partly hidden by the upper leaves of the book; behind the sun in chief three domes conjoined, per pale Azure and Tenné, prolonged downward to the uppermost arc of the sun; beneath the whole the Hebrew legend “עיריית יבנה” Azure.
