The same size is ideal for the device of bar racks: 100-150 (legs) + 960 (space closed by facades) + 38 (countertop) = 1100-1150mm.
The difference in the height of the facades is an additional opportunity for design solutions. You can provide for higher boxes (920mm or 960mm) at the edges, which will be connected by a common roof, and in the middle to hang another (720 mm high), you get an original idea of three elements with an open upper shelf.