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The naming designations are not very relevant, just do your homework on the specific lenses you're interested in.
The CV 15 works well on the 5N, but produces the magenta color shift that many of the rangefinder wide angle lenses do. It can be corrected via Lightroom Flat Field plugin or Cornerfix, sometimes less drastic measures can correct the color shift, such as purple channel saturation and hue adjustments.
Also worth noting, some of the lenses come in M or LTM mount. Optically they're the same, but not always physically (obviously I mean aside from the mount). For example, I specifically purchased the LTM version of the 15mm because it's more compact and 39mm filters can be sort of rigged up to fit snugly inside the tiny built in hood.
Other CV lenses, such as the Lanthar 90 (works great on the 5N by the way) never came in M mount.