KB50J from wiki:
"Conversions to air to air refueling tankers with improved performance from two extra General Electric J47 turbojets under the outer wings, 112 converted from B-50D, TB-50D, RB-50E, RB-50F and RB-50G aircraft."

So I guess they are both right. Since you picture shows the installed turbojets that would indicate it has finished the conversion and is now the KB 50J... unless it is just a mockup.