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It's sorta-possible. Some bar builders have done what they call "tapering" bars. This is the process by which a larger, oversized bar (pipe) is welded over the standard diameter bars that have been cut shorter. Essentially, it makes the bars look like this terrible diagram:
It's a learning process. You can learn what types of parts will work together. You can also try our Scooter Configurator. Your best option is to speak to a retailer who will know all the parts they carry and the compability. Inward Scooters is great about helping people figure out what will work together so you can order the right combination of parts from them.