I found the same thing as mikef mentioned when I changed out the Aurora for the 310, the Aurora bolt down pattern was 90? off. In my case, as the pipe and flange were one piece and glued in, I was unable to remove or rotate the flange. I had to get inventive to arrange the existing flange to fit the new toilet. I re-used the old bolts as they were still in good shape and were longer than the new ones. The seal for the 310 is completely different to that used with the Aurora but a new seal was shipped with the new toilet anyway, making it a non-issue. YMMV!!
Be careful with the water fitting on the 310, if you manage to screw it up, it will mean a new valve will be required rather than the simple plastic fitting that was used with the Aurora. None of the big hardware stores carried the necessary flexible pipe with the proper combination of end fittings I needed for the new install, only the RV store had one and they valued it very highly!
