Not really, it's like the difference between a bicycle that sometimes only has one wheel, and a motorbike with rockets on designed for sharks. FO3 mods are so much more complex, can do so much more, that supporting them is much, much harder.
Cause the GECK is a windows based program that requires a mouse and keyboard todo stuff. And considering the PS3 isnt windows it cant run the development program.
The reason PC mods cannot be ported is because of the Sony (and Mircosoft in the case of the xbox) not allowing it.