"mixed success"
Well that's not exactly news in the root and flash community (hur hur), you take your life in your own hands when you do this. Devices that appear from the outside to be the same tend to get tweaked over their lifetime, especially in the most sensitive areas - such as radio firmware.
My rule of thumb is to not flash a phone using a set of files + instructions unless I can confirm that everything on the device I'm intending to flash - especially the radio firmware - is identical to the one used to create the instructions. Otherwise there is *no* guarantee of anything working but a greater probability of owning a £500 brick.