Good news! Yes, Golden Spice and Early Gold will pollinate eachother. You shouldn't need to plant a different species. In General, most pear varieties need to be cross-pollinated by a different variety in order to produce bountiful crops, although a few are self-fruitful. To be safe, unless otherwise noted in the description, it's best to order at least 2 different varieties of pears to insure good pollination, which you have done. Please keep in mind it can take 3-5 years after planting to produce quality fruit. Hope this helps!