It depends on the model of your garage door opener and its design. The garage door sensors
lights don’t have to be the same color but at the same time their different colors might be a code telling you what’s wrong with the garage door opener, as I said – it depends on the brand and model.
My garage door opener are “naturally” green and orange and whenever there’s a problem one of them goes of or starts blinking. In many models if they both stay ON all the time, they should be OK.
If your garage door opener doesn’t open smoothly check the railings, links, wheels (entire doors assembly) for any obstruction / damage. Also make sure that there’s no debris along the bottom edge of the doors, this often triggers safety sensors and stops the door from traveling.
To make sure that the sensor lights colors (green and red) are normal for your garage door opener, get the brand and model number, browse to its manufacturer website and search for the manual.
Let me know if this helped. Thanks.