I am no expert, but I would say, yes, tube-less are harder to break. This is because the rim-to-tyre seal needs to be very good to prevent loss of pressure.
However, if you are fitting these tourances to tubed-tyre rims, then perhaps it will not be so hard. After all tubeless wheels are designed to match up and seal with the tyres, but tubed rims are only designed to hold the rim, and not seal.
I may be wrong, but that is my estimation: harder than a tubed tyre, but not as hard as a tubeless on tubeless wheel...
HTH
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