"Same glass" doesn't really tell you much about an optic or how it will perform, save that certain types of glass have properties that perform in certain ways.
The optical design, and coating choices are much more important. Two different optics using exactly the same number of elements and identical types of raw optical glass, could have widely different performance, depending on the optical design and coatings.
We can see from specs alone that the Meopro and Meostar are very different designs, although this could primarily be differences in eyepiece design.
As far as lemons go, every manufacturer (even the "Big Three") have them. There are cherries out there too, so it is best to look at a few different units, if you can, regardless of your brand choice.