Difference between metro pl and v/line pl

Heya mates, I found this difference between metro trains platform and v/line train platform. The first pic is from platform 1 of footy station and next is of platform 1 of tarny station. Why is this so ? Like is this a coincidence or what? I have seen like these on metro platforms as well in sthn cross stn. Ik its kinda sounds odd to ask but i just wanna know lol 😂