WD4003FFBX. vs. WD4005FFBX

Both 4TB RED HDD … Can someone tell me the difference between them? Other than 4005 appears newer.

Internal transfer rate is 267MB/s for the 4005 and 217MB/s for the 4003.

https://documents.westerndigital.com/content/dam/doc-library/en_us/assets/public/western-digital/product/internal-drives/wd-red-pro-hdd/product-brief-western-digital-wd-red-pro-hdd.pdf

https://gzhls.at/blob/ldb/a/4/a/7/7fc41d8aec9552187ddf82cbca8c3e7f9c17.pdf

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Thanks very much. Helpful.