Is it ok to fit different brand brake rotors to either side of my sidekick sport?

I ordered what I thought was a pair of brake rotors, when the parcel arrived there was only one.  I need to go on a road trip in a few days and another brake rotor from the same company won't arrive in time.  I was wondering if it would be safe to buy locally a rotor for the other side?

I wouldn't worry unless one is special like a drilled and slotted rotor,
other than that if it's just like stock no problems, but make sure the
same pads are used as this will affect the braking performance

Wild

Thanks, yes both side pads are the same and the rotors are stock. 

I removed the caliper and mounting bracket and the rotor was still stiff in place.  The manual says x2 8mm bolts are needed to remove the rotor, do the bolts push the rotor off the hub face?

I can't remember, but seems there is a screw that holds the rotor onto the hub

There's nothing but friction holding the rotor on, but sometimes they just just get stuck. The 8mm bolts are threaded into two holes on the rotor to push the rotor away from the hub, when it eventually pops off.

When I warped a rotor, I replaced it with one from NAPA.  That was five years ago, and with one stock rotor and one replacement, no problem so far...

Thanks, yes both side pads are the same and the rotors are stock. 

I removed the caliper and mounting bracket and the rotor was still stiff in place.  The manual says x2 8mm bolts are needed to remove the rotor, do the bolts push the rotor off the hub face?

Yes, the bolts just push the rotor of the hub.  But the problem is that the bolt holes/threads are usually so rusted up that you can't thread 2 bolts in there....so the threads will either strip out or the bolts will twist off.  What I do is just hammer on the backside of the rotor to drive it off....once the caliper is removed, there is room to smack the rotor with a hammer (turn the rotor a half a turn every couple of smacks and it should pop it right off).