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Yes, they will all have different focal points.
Some eyepieces have a claim of being "parfocal" which means the eyepiece has been designed so that they will focus at the same point, and you won't need to adjust focus when you change eyepieces.
I'm not sure which designs are parfocal, I imagine they cost more and unless there was some other reason you wanted those EP's, I wouldn't buy a set of eyepieces for parfocal reasons alone.
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