Brass plates are thinner, but noticeably heavier than the aluminum. I have a set of aluminum Ciccarelli reeds, which are 10.2 ounces, and a set of brass base Ciccarelli reeds, which are 18.2 ounces. But the brass based reeds are a slightly smaller dimension to match the old Salpa reeds, so not an exact comparison, but close enough to give an idea.

Dwight, both use steel reeds, the only difference is the plate the reeds are attached to.

Not too worried about it. Will let you know how it turns out. First I have to get my vision back