Break Issue

Is there a difference between upper and lower wheel cylinders? I found some on ebay they look identical. one is $38 the other is $58. Also, is there a difference between front and back brake hoses? Some of the ads specify front or back others don’t. I’m thinking about replacing all the hoses and at least one wheel cylinder.

The wheel cylinder does not look bad right now,but it may get worse in the future,could be from sitting then getting use,just keep an eye on it.The front has A brake hose the rear does not,it is tubing to the wheel cylinder due to the staight axle,the front suspension moves independently and needs A hose,I think the upper and lower wheel cylinders are the same,not sure check A shop manual. Mark M