You can use both Silver Coins if Gold Coins choose "various years" or newly minted copies. The various years are all years except for the year in which we live (or at the beginning of the calendar year the previous year).
Coins from previous years are often an economical choice. These coins are purchased from private sellers or institutional investors where the production margin is eliminated and logistics costs are lower. This makes it possible to offer the coin at a lower price. The conditions and prices for back sale to Holland Gold are the same for every coin.