I have an 02 Escalade LQ9 411 PCM. There were two operating systems available that year, the latter being more desirable (easier to segment swap to a 4L80e trans, for one reason). If I haven’t yet used any credits on the PCM and simply read it to discover which OS I have, can I simply find the desirable factory OS/cal in the repository and write it entirely to my PCM using only two credits total to have the PCM in the starting spot I need OR will it somehow take 4 credits for the old and new?