No a real big deal if the engines have been swapped over, but nice to know what you have, especially when looking for parts, eg, the pistons in the Aust engines had a different con rod and a press fit pin, just stuff like that.
Thanks for the pic of the plate. I have seen a few of these on different cars from time to time, but have no factory / dealer documentation on what they are or who / where they were fitted. It appears to be some sort of export plate, but I'm not 100% sure on that.