Many regulators now in EU are dual purpose - propane and butane capable. Contrary to popular belief quite often they are not pure gases but blends of propane and butane anyway. The blend depends on market destined for. For Butane - propane is often added to assist in ignition in near cold temps. Propane - butane is often added to stabilise the gas. (Laymans terms there !)
My Summer home in UK used to have Butane but because I used it at ends of seasons - needed Propane. Simple - changed bottle.
Over here in Baltic where my company is the only LPG testing facility, overseeing export of Butane and Propane into var EU countries - we get to see just about all the various blends.
I know I shouldn't say this - but as the bottles are actually same but labelled / painted differently - I refill my "guest" mobile bottles with whatever gas we are exporting at the time .. cooker / water heater etc. works same. Regulator is dual duty.
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I find the main problem is due to different regulator pressures.
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Many new regulators are dual purpose and can work with either gas. I have no idea how they do it - but they do. They are also usually smaller than the old single gas regulators.
Most cookers / gas appliances in caravans - which boat gear is usually developed from can run either gas without too much hassle. Cooker may need different burner jets. Best check any manuals / paperwork you have with appliances ...
We are parked opposite you on the pontoon! There is a chap called Enrique ( I think) who has a light blue camper van next to Pedros Texaco pontoon. He took our propane bottles up to the DISA gas plant which is near the airport. He charged 40 euros for the task so it is probably better to take them yourself ina taxi and do some shopping at the same time.I don't know if they'll do it while you wait though. Make sure the bottles are in good nick and less than 10 years old otherwise they will not fill them!