Hi. It is in SkyBob's first post, but all of us have been talking three independent things at the same time.
In your case, 11-2 is changed. Printed on 16 FEB 18 and carrying data that comes in force on EFF 1 MAR. If you open the physical binder, this 11-2 would be on the right side but overleaf, correct?
Now tt is Jeppesen's know-how, that humans are very fallible. To prevent incorrect update of the new 11-2 in paper form, they do a trick. For no other reason, just as a visual alert they put the identical time-stamp 16 FEB 18 / EFF 1 MAR on both sides of the paper sheet, i.e. on the front facing chart 11-1 as well.
Theoretically speaking you could use new-print 11-1 with "Changes: None" irrespective of the EFF date. I would advise against such practice, keep it simple and less confusing.