I put together a new(ish) build one time with a brushless motor (slightly different, same concept) and it went in reverse on my first test run. Knowing that the correct solution is to just switch any two wires (on a sensorless brushless), I was just too lazy to pull the body pins and do that. I had also taped over the bullet connectors as an extra precaution trying to keep dirt and moisture out so I knew I would have to undo two of them and redo that. So, lazily, I just threw the radio into reverse throttle, and it worked fine, but was a complete dog.
I was pissed. All this money and all this time and something was clearly wrong with the build. I ended up running into a corner I needed to back out of and wow - rocketship in reverse. turns out, the ESC was default set to 25% power while in reverse. So I finally got my lazy butt up, switched the wiring, put the radio back in normal throttle, and presto! There have been rare occasions I've needed to run reverse controls from the radio (like steering, some models mount the servo in such a way it needs reverse), but whenever possible I will switch hardware around to run controls in normal configuration. It just eliminates variables and problems down the road.
I would start by switching the wires at the bullet connectors and putting the radio back in normal throttle. I wouldn't bother desoldering the wires from the motor because your colors don't match anyway. Maybe you want to get a blue and yellow pigtail to solder on the motor so when servicing it in the future you can just go blue to blue and yellow to yellow
