Yes, they should be. I think there was a YouTube video about how they are compatible. Off the top of my head, I think the YouTuber was Inkquiring Minds? I can’t access YouTube where I am right now.
They're well worth trying! I actually prefer the A2, which is kind of their version of the old faceted Decimo. It's made of plastic instead of metal, and as such it's lighter and slightly thinner.