Changing job on approved LC and I-140

BlueOysterCult

Registered Users (C)
UnitedNations/experts,

I have read that with an approved LC and 140, an applicant can use the original PD to apply for a new LC (at a new company). Is this true? Can someone point me to the memo if you have it, please?

Does the new job have to be in the similar field? Meaning, can the approved LC and 140 for a hardware position be used, for example, for a software position at the new company?

I have ~9 months left on my H1B 6 year limit but I am sure if I join some other company I would be able to apply as EB2 (Other country) which at this time is current. Is it advisable to make the switch given the limited time I have left on H1B? My understanding is that if PERM, I-140, and I-485 doesn't finish within the 9 months that I have left on H1B, I won't be able to apply for H1B extension at the new company because my LC application will not meet the >365 day clause. Is my understanding correct?

Thanks in advance.
 
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