Nope, not all cables are 1.3, you need to make sure one is 1.3 certified when you buy. Whether it will be important or not is whether all the equipment you'll be hooking up has HDMI ports that support the 1.3 standard.
From what I can see, both support 1.3 so it will be worth it to ensure you can take advantage of deep colour, lip synch, HD audio (though you'd need an AV amp with 1.3 HDMI ports to get this) and any other features the 1.3 standard offers.