Not having been to Guangzhou , China, and tasted the food there, although we have eaten at Cantonese restaurants in Beijing, we cannot vouch for how similar the food in Guangzhou is to Flushing Cantonese restaurants, but the Cantonese restaurants we tried in Beijing were quite similar to the ones in NYC in terms of the general style of Cantonese cooking (not very spicy, fresh and natural flavors, few seasonings, minimal saucing, and a style of almost undercooking the food).
In a previous posting, link below, to the Outerboros Forum, for someone who had asked about good Flushing restaurants, we had provided information about recently attending a satisfactory luncheon banquet at the Flushing Cantonese restaurant East Lake and also provided some pictures of the dishes at the luncheon. The dishes at this banquet were all standard dishes found at most NYC Chinese Cantonese restaurants. Although we did not mention it in our previous posting, note that the dish noodles with lobster and scallops is prepared in the shape of the famous Taoist symbol of Yin and Yang.
If you click on the original thread by Sirina Tsai, there will be many recommendations in the thread for Flushing restaurants, many of them Cantonese. We are sure that if you perform a search of Chowhound, there will be many more posts with recommendations of good Cantonese Chinese restaurants in NYC.