I have a canon 480 EXIII Speedlite will the TT685II be compatible with this ?

these flashes are not compatible together however there are several work arounds you can do in order to use your equipment together. If you are using a Godox 2.4ghz transmitter, you can purchase a godox X1R-C receiver that attaches to the canon speedlite and allows you to use your canon speedlite with a godox transmitter. Alternatively if you do not have a receiver, you can place your canon speedlite in slave mode which should then fiire when responding to your godox flash.