GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: Basic Level

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I'd like to know if there's a way for me to move RGB channels without having to decompose as layers and moving them and then recompose.

Also if there's away to copy for example image1's Red channel and paste it as image2's Red channel without having to decompose and replacing layers and then recompose.

sort of found a way not exactly moving the RGB channels

but make 3 copies of original layer, name them RGB or whatever.
then for each of the copy change the level's output level to 0 accordingly
for example for for R layer set HISTOGRAM-GREEN 's output level to 0 and HISTOGRAM-BLUE's output level to 0.