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If they're old panel ones the tails will be in the wrong place for column radiators. Super-easy to change though using push-fit fittings (some people don't like push fits but they're easy to use) assuming you can lift the floor. Just rejig the piping to one of the tails and bring a new copper tail through the floor to your new location. Only issue I found was hanging big column radiators if they weigh a lot on your own....
Don't forget to drain your system before you disconnect things!
How hard is it o replace radiators? I’ve done most things DIY over the years but never messed with central heating.
I’d just be removing old ones and replacing with modern column style ones. Depending on the BTU I’d aim for roughly the same size to minimise any pipe work needing done.