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PhilDAS
All three have to match, unless there's an extraordinarily good reason - in which case the manufacturers own item can be used to make up the group (see the annoying 25.4 seatpost of the CAAD12 here).
Therefore you need to start with what bar shape works for you, that will then dictate what else you can use - for me the Rotundo shape is my favourite, which means 3T everything (apart from seatpost on the CAAD12, as mentioned).