I don't think it will. And putting the PCB inside without protection would be dangerous since any kind of contact with the enclosing / touching it with fingers/static can cause damage.
If it is important to you, I can offer you send the V1 and we'll send a V2 if you compensate for the shippment & price difference.
And don't forget the modification that is necessary for the!cart (V1 or V2) to work in the Atari 800.
the!cart V1 _will_ work in the Atari 400 without modification with the lid open and something fumbled into the switch hole to constantly press it down.