There are those who know a great deal more than I do.
There is a button accordion culture in many countries to include Norway, Sweden, Finland, Germany, Netherlands, France, Scotland, Ireland, England,
Spain, Portugal, Italy, Argentina, Cape Verde, Colombia, Panama,Quebec, Nova Scotia,Austraila...all incredible stuff.. wish I could play it all and own some of the specialized accordeons.
What makes Cajun cool, there is nothing else like it.. a subset all its own and derived from many of those countries and spiced up and evolved in a way that it cannot be mistaken for anything else. Notably there are players and groups in many of those countries who have chosen to immerse in the Cajun tradition to the point that though they are thousands of miles from Cajun Country there are nightly sessions and annual festivals dedicated to Cajun.
Incidentally, when Bobby Gardiner (usually a B/C 2 row player) plays a one row, he often plays a Hohner HA114 in G.
Here's Davis Munnelly of Ireland who usually plays a C#/D box playing a Castagnari One row in D.... same box as I play.
https://www.youtube.com/watch?v=G7cfMuJQb_I
Here he is playing a C#/D made by Bergflodt of Norway..
I strongly suggest you watch the whole video.. brilliant technique even if not your style of music..
https://www.youtube.com/watch?v=DHbe5UXOskI
And speaking of Norway.. one of my favorite players.. Might be and A/D/G of possibly a G/C/F Castagnari Handry...
https://www.youtube.com/watch?v=83B0yeRGOw4
Here's another Castagnari Hascy player from France.. this guy can play it all... from classical to folk to pop.. and beyond. This box has an outside G row then a C, then a row of sharps and flats.. or a G/C/acc box
https://www.youtube.com/watch?v=cayinI74kvA
Excellent player.. the Box is a SERAFINI "DARWIN" model...made in France..
https://www.youtube.com/watch?v=-H3gTTAfNm8
Here he is playing the same tune ( which he wrote) on a two row made in Italy..
I really like Gilles Poutoux's playing: https://m.youtube.com/user/gpoutoux
Look for sound files of John Kimmel. His earliest recordings were on Edison wax cylinders and then shellac 78 rpm discs. He played a Globe Gold Medal one row four stop box in D.
Gilles Poutoux on a Quebec made MELODIE and the other box is a Gaillard from Brittany France.. either a D/C# as played by Joe Derraine (RIP) or a very rare D/D#
https://www.youtube.com/watch?v=ol-lj12ZxIA
Gilles plays mostly Quebec and Irish tunes.
The next tune is played on two Eric Martin boxes in D.. made in France.
https://www.youtube.com/watch?v=HbmI9-uLwMA
Johnny Connolly of Ireland on a Hohner HA114.
https://www.youtube.com/watch?v=dcw4rDmAhb0
And here is Johnny Og (Son of) playing an Italian Manfrini in C#/D
Johnny Connolly also plays C#/D