one thing you need is key- and speed-changing software for your computer
boozoo used accordions in many keys, C, then B flat, then A on later records
you have to figure out what the key is and change it to where it works on C accordion
also you have to know another key thing - most commonly zydeco is played in 'cross-harp' style
meaning if a song is in G, it was more than likely played on a C box
F would be on a B flat
E would be an A
so on
this is not always the case, stuff in minor keys uses a different translation
usually E minor uses a C box, for instance [because it is the same notes as G major]