another frame swap question truck on burb frame

[clear-lake-gmc]

i did a search but most results are for putting 67-72 cabs and beds on newer suburban chassis's but not much for the same era

i have also found that the 67-72 truck and burb frames are the same except for the rear of the burb is different?

i have a 71 gmc long bed stepside and found a 68 burb just trying to find out in detail what would have to be done body mounts moved etc