Well, difficult to say something about the second one on yahoo Auction Japan as the explanations are in Japanese,
But, very similar shape and look. Same size, very very good condition for something to be said from the 18th. Too good to be true for my point of view,
Maedate is a very difficult field as a lot of fake or modern pieces are on the market, very easy to make them look like old pieces because they necessitate less work than for an armour, a kabuto or a sword.
Genuine pieces are supposed to be quite rare as the maedate is the more fragile part of the armour, easy to break or to loose. then a lot disappeared while kabutos remained.
In front of a genuine piece it is sometime difficult to say whether it is 17th 18th or 19th, again because the piece being fragile it generally deteriorates more rapidly than the rest of the armour.
My two cents