In Mercurial, is it exactly the same doing "hg vdiff -r -2:-3" and "hg vdiff -c -2"?

Question

Because I used to always do

hg vdiff -r -2:-3
hg vdiff -r 5213:5212

are all the hg commands exactly the same using those, vs using

hg vdiff -c -2
hg vdiff -r 5213

?

Answer 1

Use hg help revisions to see all the various ways you can specify revisions, which should work with all subcommands.

Answer 2

The -c option means changes introduces by this revision, so hg foobar -c 23 is the same as hg foobar -r22:23 if 22 is the first parent of 23. When 22 and 23 are not in a parent0-child relationship, you get the diff of two random changesets.