need some help clarifying the vr1 race oil

What the difference between these two oils besides that one says its a synthetic? Is it good to use synthetic oil on a stroker motor that was fresahly built with 580miles (hyd flat tappet cam)

http://www.jegs.com/i/Valvoline Racing/949/VV211/10002/-1?CT=999
and
http://www.jegs.com/i/Valvoline+Racing/949/VV855/10002/-1