I don’t doubt your results, but there’s some details here that don’t quite match up.
The Flash installer that ships with Kylo isn’t custom to Kylo. It’s not installing to a Kylo-specific location. We try to package the latest version of Flash available whenever we make a release. With version 1.1.0 of Kylo, I just grabbed the latest 32 bit, plugin-browser flavor of the Flash redistributable via Adobe through our affiliate link - version 184.108.40.206. With the very first version of Kylo, we shipped Flash version 10.0.45.2. Flash hasn’t been installing to browser-specific plugin locations since 9.0.r28. You can read more here: http://kb.mozillazine.org/Flash#Installing_Flash_on_Windows
Also, because of how flash is installed to a global location for all Mozilla browsers, if you install a new version of Flash in Firefox, then install a new version in Kylo, you’re just copying over the same install for both browsers. I think it’s possible to have different versions of Flash between Chrome and Firefox/Kylo even though they both will use the global plugin install.
The other thing that seems screwy is that I’m pretty sure Vettle isn’t Flash-based. It seems to install a custom plugin that includes what looks like a custom version of the VLC plugin. I could be wrong about that, I’m just gleaning details from about:plugins.
Anyway…. I’ll keep testing… thanks for the info!