Cored Solder Wire & Supplemental Flux compatiblility

I have always been under the impression that you want the flux make-up of your cored wire and supplemental flux (squeeze bottle) to be as identical/compatible as possible.

I was just looking over a manufacturers datasheet for a resin-based cored wire. They suggest a resin/rosin free supplemental flux. Wouldn't it be more desirable to use a resin-based supplemental flux in this case to keep the results consistent and more predictable?

Thank You.

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