Raynox DCR-250, the same for all brands?

[ASBR]

In the store where I ordered mine there were loads of different DCR-250's to order.
One for the S1 (the one I got for my S3), one for G1/G2, one for Nikon 5700/8700, one for Sony DSC-V3, and so on and so on.

Whats up with this? Aren't all DCR-250 the same, since they have universal mounting thanks to the snap-on attaching used?
Or are they all optically different, and in some way optimized for different types of cameras?


Not that it matters to me, I already have one and its really great, but I wonder how it works, and maybe a friend of mine is gonna get one for his Sony (which isn't listed in the store).


Thanks