Will Astra 600 slide/ upper run on a 400 lower?

Will Astra 600 slide/ upper run on a 400 lower?

While I can't give a definitive no, I would not think so. The 600 in theory is just a re-barreled 400 but the frame is shorter and the magazine release is different. The magazine well is also a bit longer in the 600.

Don't know if it's just mine, but the extractor groove is smaller on my 800's barrel, for one.