Best if it looks like & fits like the original, but that does not determine how it works.
There are only 3 important data points:
1. high vacuum orifice (cruising, light throttle)
2. low vacuum orifice (big throttle opening)
3. internal spring which sees engine vacuum and moves the internal restrictor cone to select 1. or 2.
If the engine is stock, a PCV from a very similar engine (size, power, tune) may work well.
If the engine has a big cam, the stock PCV will not work as intended.
