accuracy of floating point calculations: d vs cpp

[drug]

I have almost identical (I believe it at least) implementation (D and 
C++) of the same algorithm that uses Kalman filtering. These 
implementations though show different results (least significant 
digits). Before I start investigating I would like to ask if this issue 
(different results of floating points calculation for D and C++) is well 
known? May be I can read something about that in web? Does D 
implementation of floating point types is different than the one of C++?

Most of all I'm interesting in equal results to ease comparing outputs 
of both implementations between each other. The accuracy itself is 
enough in my case, but this difference is annoying in some cases.