the rotten timber is standard pine commonly used for house framing there are many spiecies of pine and yes some do look alot like oregon, the milled finish is known as laser cut. if you read the stamps on it when it was new it would have been likely stamped laserframe mgp10.
for the rebuild either treated pine of which there are many types but if its going to be in the weather it needs to be at least a h3 rating for above ground or h4 rating if in contact with the ground also note if you really want it to last you need to retreat any cuts you make as most treated pine avaliable in vic these days is LOSP type treatment which doesnt penetrate right to the centre of the board. the good news is you can buy losp treatment in tins just like paint. any treated pine should have a small tage on the end of the board telling you what the tereatment type is, cca tends to have a green tinge to the timber while losp is visually difficult to notice a difference but typically has a oily feel and turps/kero type smell
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