Test Presses should essentially be the exact same format as the official release... this is the idea of a test press.. something to send the label to ensure everything is ok before they run 1000 copies etc...
Promos, again should be exactly the same just no artwork and used to (not sure if the case anymore) be used to determine whether there is a point in going through a full release with artwork. If the 200 copy promo run doesnt sell out then why press another 1000 copies.. capiche???
Vinyl Dubplate... they are what it says on the tin. It is a one off dubplate cut onto vinyl. Will be pretty much exactly the same as any vinyl you buy in the shops just probably the only copy in existance...
Acetate dubplate... made of a lesser quality material, not used very much anymore as on average you'd get between 50 & 100 plays before it starts to wearout. These dont feel like vinyl and feel more like a thin chunk of metal.. u can notice an acetate dub from the moment its put in your hands..