WooCommerce Better Compare plugin supports custom meta and taxonomy fields by default. Up to 4 of each type can be created and drag / drop into the comparison table.
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would it be possible to display the seller, in this case the seller of the wcfm plugin?
The Real Person!
If this is a custom meta or taxonomy then you can display that field in the compare table.
Can we compare fields created using ACF plugin?
The Real Person!
When these are simple ACF fields (not multidimensional / multi fields) then yes.