I have created two square polygons each having an area of roughly 5.000ha. One of the polygons is located in Australia and the other one in Iceland, because I am working with relatively large areas which are located in different regions of the world I have created each polygon in a different CRS. I have used WGS 84 / UTM zone 26N and WGS 84 / UTM zone 54N. I want to work with both polygons in one project. What is the best way to do this? Will it work if I reproject both of them to for instance WGS 84 / Pseudo-Mercator?