Uiua SBCS , 19 bytes
⬚@0円∵⍜∩(-@0円)⍜∩⋯⬚0≠
⬚@0円∵⍜∩(-@0円)⍜∩⋯⬚0≠
∵ # map over corresponding chars w/ dyadic function
⬚@0円 # padding shorter input w/ null
⍜∩(-@0円) # apply to code points
⍜∩⋯⬚0≠ # xor
chunes
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