The brain and kidney do have similarities though.

Reversible vitrification of major organs is a reasonable prospect within this decade. What about vitrification of whole animals? This is a much more difficult problem. Some organs, such as the kidney and brain, are privileged organs for vitrification because of their high blood flow rate. This allows vitrification chemicals to enter and leave them quickly before there are toxic effects. Most other tissues would not survive the long chemical exposure time required to absorb a sufficient concentration to prevent freezing.

Medical Time Travel

I'm not too optimistic about reversal of full-body preservations performed in the next few decades. I am much more optimistic about prospects of regrowing the non-brain organs and creating a new body from them.