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@Momentum
They are all similar but are not the same. There are Italian and English standards and they are close enough that they are interchangeable. However, mismatching the cog/hub (e.g. Dura Ace sprocket (English) on Campy hub(Italian)) slightly damages the threads. This isn't a problem in itself, but if you then put an Italian threaded cog on there then there is a greater chance of stripping the hub.
In addition, all the manufacturers tolerances vary a bit which can lead to the same problem.
The best practice is to stick to one manufacturer if possible to be absolutely safe. I use a cpmbo of DA, EAI and Surly cogs on my bikes and so far all is good. However, if I had just bought some new Phil hubs then I would probably stick with Phil cogs to be as safe as possible.
Lockrings are a whole different ball game. Here the standards are significantly different. I think Phil uses Italian lockrings so it's Capy or Phil for you. Again, I'd go Phil as I've heard that Campy ones are a bit shit.