Let me try to answer your questions here one by one...
The blue one dried to a glossy finish.Can I expect the silver one to do the same?
The Blue Angel Blue color is FS15050. Since it begins with a 1, that means it will produce a glossy finish which is exactly what you got. Chrome Silver's FS number is FS17178. Once again, since it begins with a 1, it will produce a glossy finish. From my experiences, this has always been true. Chrome Silver will produce a glossy finish.
Are they the same kind of paint?
I have no clue. Chrome silver though has bits of metal mixed into it to produce a metalicized paint, the blue doesn't. Since they're both enamels, they will thin well to mineral spirits paint thinner.
Will the silver one need to be sealed with something before I start decaling?
No, since you will be applying the decals to a glossy finish, there aren't any clear coats that need to be applied prior to decal application. The whole reason we use future is that when painting military models, often we use flat paints. Decals don't apply well to "rough" surfaces. Applying future allows a flat paint to turn glossy and smooth which is mucher better for decal adhesion.