!ask if I use shady spectacles on a 1 might unit to copy a baron and then use another shady spectacles and choose the other unit with shady spectacles does it also become a baron

Yes — the second unit becomes a copy of Baron Nashor.

Copy effects copy the copyable traits of the chosen unit (Name, Type, Tags, Cost, Domain, Rules Text — Rule 477.1.b.1.a). When your first unit became a copy of Baron, its copyable traits were updated to Baron's, so a second Shady Spectacles choosing that unit copies Baron's traits right through it — "if you copy a copy, the new copy becomes a copy of the originally copied object" (Rule 477.1.b.1.b).

One caveat: the second copy is an in-play unit, so Baron's "As you play me" clause won't fire — no extra Baron Pit token. But it will be a 12 Might Baron with "I can't be chosen by enemy spells and abilities" and the +2 Shield aura, for as long as its Shady Spectacles stays attached.