I did that exact thing. Pulled my old 1TB that I had upgraded my 64gbLCD with and put it in the OLED. Couldn’t think of a reason not to put the OLED 512 in the old LCD. I’ve still got that 64gb sitting around and that what I’ll be putting in the OLED if I have to RMA it ever.
Not necessarily, but a lot of times when they RMA they will just send you a new deck. Or at least they were doing that in the early days of the LCD. Quite a few folks lost their upgraded SSDs at that time.