They're from different bulk order packages. The one ending in "10" is from the OEM 10-pack; "R5" is from the 5-pack for resellers. It's possible the OEM version has less branding, but the hardware itself should be identical regardless.
Source:
http://ark.intel.com/products/81039/Intel-SSD-730-Series-480GB-2_5in-SATA-6Gbs-20nm-MLC#@ordering