Yes, the litho printing was well done making them hard to tell apart. You need to look at these with a magnifier. The engraved clearly has printing raised up above the paper surface while the litho is dead flat against the paper.
All you need is a 10X magnifier or less, not a microscope view as shown. The left side shows the upper left corner of an engraved
2dr lighted from the side to try to emphasize the raised printing. The right side is from the litho
2dr; note that the more ragged look of the edges of lines expected of many litho printings is evident under magnification.
As an aside, the engraved 25L is almost always misidentified in collections, too.