The first picture is that of a '55 first series Chevy. The trucks in the second picture are a '54 on the left and a '55 first series on the right. This is based upon the differences in the emblems on the side of the hoods. I agree with 54Tow in that there is a reflection or shadow on the windshield of the truck in the first picture, giving the appearance of a split windshield. Other pictures in the link, showing the shop truck they are building, do show a split window cab.
I hope this answers your question.
