I stand corrected; msycamore is right that the LFL logos on the two films are different. -1, here's your versions of the logo separately.

SW:

ESB:

It isn't just the spacing, they are in fact different fonts. The SW version is Univers, while the ESB version is Helvetica. I know msycamore said they use the same font, but look at the top of the "t" in "Production." In SW, the dot of the "i" is completely over the head of the "t", while in ESB, the "t" and "i" are almost the same height. When I typed it out in Univers, it matched SW, and when I typed it out in Helvetica, it matched ESB.

So to clarify, the LFL logo was different on every movie, but "ALTA" was the same on SW and ESB and changed for ROTJ.