It’s just a different size bearing that feels a little different in how it plays. Read the Sunrise yo-yo description, it describes it a bit:
If you do get a pair of 720s, you might want to get a pair of blue spacers. The default setup is a bit extreme. I use one blue and one red in each 720, and I find that to be pretty much perfect. String makes a difference too, with thicker string you might even do better with two blues. I use this string:
I also use YYF Limewire, which is cheap and works fine too, but I burn through it pretty fast. Not having to change string all the time is what I like most about the First Salud Loop String.