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The ES have been sealed and purged with dry gas. The Meade's were not.
There are also additional focal lengths. And the 18mm is a 2" now, where it was a 1.25" before.
But, it does seem that they may be identical internally except for that.
JOC made the Meades and makes the ES. Your guess as to whether they changed any internal configurations that changed the eyepieces (i.e. coatings, glass types, etc.).
The lower prices are probably because a middleman has been cut out of the supply chain.
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