Thanks First C10, I appreciate the info. The 88 Suburban was already converted to r134 before I started the swap so I think I'm in good shape there. However I am going to flush the Suburban's lines and get a new dryer just to be safe.
However my biggest hurdle is just trying to find adapters to allow my Suburban AC lines to attach to the 2016 AC compressor. Similar to the item link below.
https://www.summitracing.com/parts/vta-045024?rrec=true
I just haven't found a good way to connect the Suburban AC lines to the compressor. Reading threads it looks like some folks have done it but I'm unclear how they did it and what hardware they used.