• The chords sequence has the same pattern, but there are some different details. I don't know if they are really meant to be like this, or is it just some improvising from the pianist? I think you can feel free to use them as you want.
The lower G for example is followed by a G, or by a B and D:
The E is followed by a B and E, or just by a B:
• About the rhythm: is the piece a 2/4 measure with triplets in the right hand?:
Yes, but I prefer to not use triplets. On this page I explain why: Three against two, an exercise.