Yes, they are on different subnets.
You need to turn off DNS on your PC, and set the IP address of the PC to something like 192.168.1.2, where the 2 can really be anything as long as it doesn't conflict with the cameras address.
I would have a very simple setup, like turn off wifi on the PC (if you have it), and then just connect the PC to the switch, and the camera to the switch. You should effectively have a three piece network of the camera, switch and PC.
Now the cam and PC are on the same subnet, and you should be able to talk to the camera. You can now change the ip address of the camera to an address in your normal subnet.
Do one cam at a time, for both cameras. Give cameras different addresses that won't conflict with anything else, and record the addresses somewhere. Then turn DNS back on for your PC, and everything should be on the same subnet.