The question concerns the execution of the march time, that writing is like the 4/4, but it is actually a 2/2: how to feel the difference? It also asks: If the reviser indicates 76 to half-note, what is the difference compared to a 152 to quarter note?
The speed depends on the interpretationFrom the mathematical point of view is the same: 76 at half-note equivalent to 152 to the quarter note. But from the musical point of view is different: it means that the music must be thought of in two beats per measure, instead of four. If it seems too fast, you can play a little more slowly, but the important thing is going to keep this rhythm in two movements, which is just the march. Keep in mind, in fact, that the values of metronome are purely indicative, the musical interpretation does not mean never so stiff. Try therefore to study the piece at a speed of 60 to half-note: first try to sing the parts at this speed (especially the right hand, but also the left!) to get used to this scan.
A matter of accentsThe difference in performance between 4/4 and 2/2 is a matter of accents. For example, in bar 1 (apart from the upbeat E flat-G, which obviously leans on the beat in B flat) is interesting figuration into eighths (C-D-E flat-B flat), followed by G quarter: the support should be given to the E flat and certainly not on the C, or only at the end of the beat, the next support will be the next G (eighth) that starts the bar 2. Note that the rhythm of the left hand helps the rhythmic beat.
Interesting then the bar 5, where they begin the triplets: we find a triplet eighths (F-E flat-D), where clearly we lean on F, then the two D (eighth), which must not be accented, whereas we lean a shortly above the D, who began the succession of eighth D-F-E flat-D. The beats subsequent steps like: avoid the accents on the second and fourth movements, unless there is syncope (as occurs in beat 3), which is the evident "exception to the rule" and what is its meaning.