Let's put it like this. Its german TUV/approval documents only cover the 906 so here in Germany you can only use it for that. It is possible that the P750 isn't listed simply because they didn't have one to test it with. I don't know. The dry weight of the P750 is 195kg, the 906s is 205kg so maybe the spring Wilbers used in it might be a little stiffer than one they would use for a P750 shock. (They don't offer a P750 shock).
Other manufacturers like Bitubo make one shock that fits both P750 and 906 and size-wise, due to the same frame dimensions and the identical swingarm, they are identical.
It might be a german thing. Many parts for brakes, suspension etc require approval documents which means manufacturers have to get single approval for every vehicle they want to sell the parts for which is costly. If a vehicle isn't listed in those documents (it may the the same model of vehicle but with a different motorisation) you can't legally use that part on it which does not mean you can't visit the TUV yourself and try to get it approved this way. Of course you'll have to pay for that inspection and approval and it isn't said that the TUV inspector will actually approve it. The german burocracy regarding all this is rather strange and sometimes a bit confusing. For instance there are different type of approval documents like the ones you just have to carry with you to prove the legality, others require inspection by the TUV and documenting in your vehicle papers. Then there are material reports ... you get the picture 
The Wilbers next to a P750 Marzocchi. They are both 365mm long. Mounting point width and size are all identical.
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