I was going to add a sticker on my main Wii remote to differentiate it from the extra one I bought. The reason for this is when I bring my Wii remote to a friends house to play, I want to make sure I have the remote that has my Mii saved on it.
Before I did, I tried to see if i could spot any visual differences in the two remotes that looked identically the same.
Upon closer inspection, I noticed the lil brail dots above the blue led indicators are larger on the individually packaged remote than the dots on the remote than came with my Wii. Not alot larger but noticable by feel and you can see it.
Now I can easily tell which remote is which.
I'm not sure if this is the case for all of them, but it is for mine. I wonder what the reason is for the slight change.
Here's a pic I took. The one on the right is the one that came with my system.