The link is off because it is now 4 years old. However, I attach an image of the FBI poster. I think there is little doubt it is the same man. Firstly the name matches, not just first and surname but also middle name - an unusual combination. Secondly, the poster picture of him is remarkably similar to the picture on this site (minus the moustache). Thirdly, the other features also match (age, height, scar). I note your comment about the eyes in a previous post. Hazel is a shade of brown and hazel eyes are often listed as brown.
Sizemore seems to have been a significant criminal. A 1970 report from the Fort Lauderdale News reads;
"In Bahama Case Benny Ray Taylor, 33, of Hollywood, pleaded guilty yesterday to transporting $329,000 in stolen cash, blank checks and jewels from the Bahamas to South Florida. At the same time, Taylor's red-haired wife, Sherry, and two South Florida men, William Carpenter and John Hallett, pleaded guilty in U.S. District Court, Miami, to conspiring to have the loot transported. No date was set for sentencing. Taylor had been accused of taking part in robberies at the Barclays Bank, Royal Bank of Canada and the' Ginza Jewelry Shop, all in Freeport, in 1969 and early this year. Charges are still pending against three other persons in connection with the robberies. They are George Brummett of Miami who was apprehended in Kentucky, George Traber, 37, of Miami Beach-and Shirley Sizemore of Miami. Mrs'. Sizemore's husband, Gary Vaughn Sizemore, is still being sought by the FBI. During one of the robberies, the bandits held police at gunpoint, took one officer hostage and wounded a civilian."
I also attach a clipping from the Miami News about the same case.