It should work on a Japanese 3DS no problem. If you're using a homebrew userland only exploit though, you're not going to be able to open Street Pass IIRC. You're going to need an older version that I not longer have and full CFW for it to work...
Those images are VERY different things. PM is a error for the DS firm. and the other means something different from that. You cannot go by similar as they are all likely different.