I think the P/N SEC-HR3U4BPN (2nd link) refer to 2nd Generation of the Eneloop battery which rated at 1500 rechargeable times while the P/N HR-3UTGB-4BP refer to the 3rd Generation of the Eneloop battery which rated at 1800 rechargeable times.
From what I read, the 3rd generation Eneloop is better than the older generation in terms of charge retaining.
So just based on the price, I will for sure pick the newer generation. And I believe that is the last generation of the Eneloop battery that still have the Sanyo brand instead of Panasonic.