Is my iphone 11 up to date with my new sim card

On iPhone, Sim cards contain nothing more than your telephone number and have nothing to do with keeping the operating system up to date.

If you go to Settings > General > About > Version > If your phone is on iOS 15.0.1, you are up to date. If you version is lower, you are not up to date.

You could have two IMEI because you have dual Sim phone and if in the US, you could have a physical and eSim attached to your phone or if your phone was made for China, Macau or Hong Kong, two physical sims.

Again, the sim card does not make a phone up to date. I've been on iOS since minutes since it was released and now iOS 15.0.1 without any troubling hiccups at all.