There is a difference. The WeTab runs i386, while N900 runs ARMEL. The Android on WeTab is run in VirtualBox, which is a virtual machine. On N900 we don't have that (yet). And if we did, it would be hard to port. (VB is heavily based on the instruction set for desktop processors, like virtualization-support.) It wouldn't work as well on N900 as on the WeTab.