Remember: the "newness" comes from verification, not publication date. Always check your file hashes, avoid suspicious pack sites, and respect intellectual property by owning the hardware your BIOS represents.
Yes. The SCPH-10001 launch model had a buggy IOP that can cause audio desync in emulation. The 39001 is more refined. scph39001bin file new
– Sony released minor BIOS revisions (e.g., v1.60, v1.70, v2.00) internally. Some "new" dumps might actually be a different sub-version that fixes obscure bugs in emulation, such as FMV synchronization or USB mouse support in Linux for PS2. Remember: the "newness" comes from verification