Depends, if one of the old ones failed with open circuit or if they were unplugged whithout the battery to be disconnected first then calibration is compulsory, also it's possibe to have to calibrate if they are other brand so better expect it to be necessary.
I used to replace with genuine LR sensors, but they don’t last any better than aftermarket ones. Jack it up so the axle is hanging then disconnect the battery before you do anything and it should be fine. LR would tell you it needs connected to their system tool, I think it’s called Test Book, to deflate the bags, but just puncture them with something sharp. It’s not a difficult job really.
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