YUP it’s a 20 amp cable.. Sometimes on the wall side people use a 125vac 25 amp male plug still the other end is a 20 amp design. It is made that way. I have the same.. I even add twist locks for my shop amps and 20 amp cable for my modded 565 Brains MBs.. Usually heavy copper too.. The good one are anyway. Silver too..
BTW I looked at a pic, that's a female going into your amp.. The outside determines the sex buddy..
not the inside.. LOL It's all good..