Replacing Macbook Pro SSD with Macbook Air SSD
I agree with Matthew.
MBA early 2015 connector PCLE 8GT/s
MBP mid 2014 connector PCLE 5GT/s.
I suppose it can be done, but I would not do it at all.
You have to reinstall everything including the EFi and RecoveryPartitions, otherwise it will not work at all.