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I need to order a neutralizing antibody to block a protein of interest.

The pure grade functioning antibody (no conjugates) is substantially more expensive than the fluorophore conjugatated ones.

Can I achieve the same by using let's say Ab conjugated with APC/PE as a neutralizing antibody compared to the pure functioning grade ones?

Any insight would be great.

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In short, yes, most likely. When an antibody binds to the antigen at a region (epitope) that is needed for the antigen's activity then the activity is reduced ("neutralized"). The (proper) labeling of an antibody will usually not affect which epitopes it binds to, and so it will work OK (but it may have lower titer than the unlabeled antibody). As always, there may be some exceptions to this.

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