Thanks Chris,your answer was very helpful.
Sorry if the post was hard to follow,my doubt pretty much relate to the foundation workout.
I hope the image attached will help to understand my doubt more clearly.I have choosen the chest muscle for the example.
Apparently,the chest muscle developed are different from each other in dimensions.
Like the second one appears to be more triangular in shape,while the fourth one has more like a neat square shape unlike the last one which is a bit streched down and outwards.
Though all of them look muscular.
Basically,these people might have followed different workout routine/program when they were new to bodybuilding . Likewise the same idea applies to other body parts/muscle group too.
Whether the shape a person develops depend upon genetics,individual's bodyframe,muscle's tendency to adapt irrespective of what workout he followed as a beginner or one can transform from second to fourth ,vice-versa and so on..
Please help me interpret my doubt more elaborate if is miss something out ,so others can benefit from itand for future references.