need help with 12 bolt and abs

[J02ws6transam2]

hey guys i have a 02 ws6 with the a abs sensor on each wheel. I also have a 00 formula which does not. now the 00 formula has a brand new strange 12 bolt in it that i want to swap over to my 02 trans am because i am selling the formula and want the 12 bolt for a project im working on the the trans am. What do i do with the abs so it works on both car, because ih i sell the formula it has to have abs for legal reason im sure ya know. i dont know what the formula has for abs, but i did a quick look under neath it and saw that were my 02 trans am has the sensor on each rear wheel, the formula does not. so im geussing it has the one sensor up by the top of the rear end. pleaes help. Thanks
Jon

[J02ws6transam2]

i geuss what im asking is that can i use a 4 channels abs rear end on a 3 channel system and a 3 channel abs rear end on a 4 channel system. thanks
Jon