Can you give a ref for the 183 days?
140 is pretty fast right now. I know a friend got it in less than two months.
My understanding was, as long as your previous company didn't revoke the 140
application, you could go ahead with changing the job now. Most likely it
would get approved and you could keep the PD. To play safer, you could wait
until 140 was really approved. But the above is experience without knowing
about 183-day rule, if that's something new.