Several small variants exist on the different models.

The first and one of the most visible concerning the part in plastic on the top of the body that I would call "ladder"
They are two different types, one with a rod of reinforcement and the other without:

White Eagle Freighter, Green Eagle transporter 2 nd release are with the two types
Green Eagle transporter 1 st release are with the type without the rod of reinforcement.
Blue Eagle are with the type with the rod of reinforcement.

As it is extremely easy to change this part of an eagle to the other without letting trace, one can find other variations but I think that it is not factory-built.