I got this LaCie Rugged RAID TB LRD00M1 drive in with one of the drives dead. I believe it is set up in RAID 0 so both drives have to be recovered. One drive cloned 100% fine, the other drive I opened up to find the sliders ripped off and stuck to the platters.

I removed the sliders but don't have a compatible ST2000LM003 donor on hand (tried two with matching HSA preamps but was still stuck BSY). I'm wondering if I can simply just use the other RAID drive that cloned 100% fine as a donor since it appears to be a perfect match in every aspect. Is the LaCie truly hardware RAID 0? If not, will it care about mismatched drive serial numbers if I make a clone and attach the clones back to the controller?

Why would you be connecting any drives back to the RAID controller? Use R-Studio or UFS to virtually reconstruct the RAID and copy the files out to a new storage device. If you do use the good drive for parts, remember that you would then have only one copy of that drive and should consider making another clone, just in case the unthinkable happens.

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Luke
Recovery Force Donor Inventory: 5,000+ Fully Cataloged HDDs & Growing

Looks like it could be RAID 0 or RAID 1.
https://www.cnet.com/products/lacie-rug ... olt/specs/
So, depending on the capacity of the volume on the working drive (if showing), then you could tell. Also, since data is not accessible on the one drive, then should rule out RAID 1 option.

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Hard Disk Drive (HDD), Solid State Drive (SSD, SATA, NVMe, etc), USB Flash Drive and RAID Data Recovery Specialist in Massachusetts

Given that you only "think" it was set up as RAID 0, you should check out that drive you already cloned to be "sure" it wasn't a simple RAID 1 mirror set. Assuming it was RAID 0 and the drives were originally in the enclosure together or bought together, it's a very good chance they are compatible for heads. If you post a picture of both labels we can probably confirm that for you.

That having been said, if you actually need the data back and haven't performed heads replacements before, or don't have access to professional equipment like PC-3000 to stabilize the drive afterward, it's almost certain that you're going to fail to recover the data. Perhaps pro recovery would be a better option to consider.

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Data Medics - Hard Drive, SSD, and RAID Data Recovery Service Company