notice: people can't even agree whether two samples of the same board make anywhere near the same noise!
Well actually there's a few potential logical explanations
1. We are in different climates (i'm currently in winter and yes it gets chilly in Africa, not as bad as England but it can be worse as the house doesn't have central heating/double glazing/insulation).
2. Probably not using the same desks
3. Rooms have different reverb properties e.g. Singing in the shower always sounds fuller than singing in the lounge..
4. Our hearing ranges might be slightly different e.g. My friend can't tell the difference between $9 headphones vs $100~ apart from comfort...
5. Given that it is just certain keys perhaps the 'problem' lies in the springs in some cases (not too sure this makes much sense)
End of the day I think you have to expect some noise of the metalic ping with cherry mx switches. If it's too much for you then return the board no real harm in that, it is likely that some boards will 'ping' less or more when newer or in certain conditions..