Yes you could.
But you can also download more simulators in XCode.
In the simulators menu at top of XCode, select more simulators, then add those you need.
Thanks a lot for your reply, @Claude31!
So, should I finally upload the screenshots I have used in 3rd gen to 2nd gen?
Will my app be approved if I do this?
I have already got apps approved using 3rd gen for 2nd gen screenshots.
But if you can get the 2nd gen screenshots, just better. avaoid any risk.