The best way to know if and when your pears are ready to harvest is test a sample at the Benton County Extension Office (4077 SW Research Way, Corvallis, OR). Take 3 pears of each type for testing. The test is free. Someone at the Extension Office will perform a Brix Test on your pears. Here is a link to a paper on testing pears http://extension.oregonstate.edu/gardening/node/413. Identifying the type of pear is much like doing the same for apples, very difficult even when you have the fruit in your hand. Having only a photograph makes the identification even harder and the misidentification easier. I suggest that you leave the sample you take into the extension office for possible identification.