Not perfect but, if you don't already have one, this might help (it has the Euro dual seat).

Yamaha DT2 RT2 Motorcycle Parts Manual Engine Frame Parts Catalog | eBay UK

Peter,  I agree with Alan about it not being likely Yamaha produced a different 360, especially for what was a very small market back then.  

Please know that "HP" in the USA was an advertised number in those years. So was fuel mileage.  Many magazine test made that clear by clearly stating the specification as "advertised horsepower".  The advertised numbers were usually inflated by measuring the power at the crankshaft and other tricks (cool air, etc) to come up with a higher number.    

Do you know the standards Germany used to test the power in 1973?  The 32 HP number advertised in the USA was certainly not at the rear wheel and my guess is the "15 kw" number was an actual real-life measurement at the rear wheel.  15 kw is equivalent to about 20 HP.  It is very possible a standard RT3 has 20 net HP when measured at the rear wheel.  

A good example is the HP for cars in the USA.  In 1972 they made a law in the US that required manufacturers to use a standardized "as installed" test procedures defined by the SAE (Society of Automotive Engineers) instead of using "advertised HP".  Most cars lost roughly 1/3rd of their "advertised" horsepower when this change was mandated here.  

The "300 gross HP" that was advertised in 1971 might have become 200 net HP in 1972 even though the engine was exactly the same.

When they developed HP standards for motorcycles here (1974?), Yamaha stopped listing their "advertised HP".  

www.mansfieldcity.org/what-year-did-horsepower-ratings-change

Thanks Mark.

It would be interesting to see what our Antipodean members' observations are on this, as compared against their models. Also, I wonder if Japanese Domestic Market (JDM) models had their own output specs?

Hi,
this is a typical German thing. Everything has its rule. We have this insurance thing in Germany. If your Bike ist that , then you pay this and if your bike has under 15 KW thean you pay less.... This was the case in the 70th and te reason why Yamaha offered the 15KW version. I have a copy from a licence of a german Bike with 32HP, so both was possible. The only thing is, that i have no idea how they technical made it.