Just curious, which 3 versions?

I know there’s the previous Sofirn C8F (18650) without tailswitch and the Sofirn C8F (21700) with tailswitch — I’ve tried these 2 models. I have not tried the UTorch C8F (21700) yet. Does Sofirn have an “old” and a “new” version of the Sofirn C8F (21700), thus the “3 versions”? If so, what’s the difference?