It doesn't matter what language it is, because gamestudio does only support C-Script and Lite-C. Alternatively you can use C++ to write plugins or various languages to use the engine sdk.

Asking whether you can use the Blitz3D SDK with 3D Gamestudio is basically like asking whether one could install both, an ATI driver and an nVidia driver on one machine, to gain the best from both of them.