Mixing and matching Bosch plungers and heads

[anto]

If you have all pieces, clean them up with some fine wire brushes and slip them back together. If theres diesel there I doubt it'd take that long to work out which ones from which based on how they all feel when the plunger is pounding head. If ones loose, ones tight

Id be tempted to do that, but unless the difference is obvious id advise against using it. I cant see the difference being obvious unfortunately.