Straight 99%+ cbd crystals properly isolated from industrial hemp are still almost, if not exactly as much straight cbd as if they were isolated from cannabis.
I know we all tend to avoid hemp derived extracts, and where those are not near-pure cbd isolates (as in when the extract is not 99%+ cbd and little else of anything), these should be avoided. This is because industrial hemp when crudely extracted imparts a majority of non-medically active compounds and does not give meaningful amounts of cbd in such a crude extract.
99%+cbd crystals however are another matter and these will be as good as any other straight cbd. Mix some of it in nicely with your terpiest rosins and see how you go
always check for certificates for lab test results and make sure what you are buying checks out.