EB2 to EB1 transfer

[Regal]

I was working with employer A in India at manager position till 2017. I moved to US on H1B with employer B and got my GC filed in EB2 in mid 2018.

I am getting an offer from employer A now. Can my case be moved from EB2 to EB1.

Thanks in advance for the help.

[NPN]

I am also in the similar situation. Can some expert from the group help by sharing their experience.