I believe it’s an age thing. Back in the day everybody had their own plug with the wires in various orders. Eventually everybody standardized on what is essentially a Futaba J plug (without the little side tab for non Futaba). If it has a blue wire, and it plugs in without much difficulty, I believe you should be good to go.

Just make sure the order matches what you know already works on your receiver, black (-), red (+), and other (signal, usually blue or white).

Unless you have JR/Spektrum, they use their own colors still, brown (-), red (+), yellow (signal).