Can I "merge" two groups using SID history?

Solution 1:

You can't modify the SIDHistory attribute as it's a protected attribute.

One of the only supported methods of doing so is using the AD Migration Tool. There are some Powershell/scripts but they all would require that the groups reside in different domains/forests.

The only way you would be able to accomplish this is as TheCleaner specified. You would make the group that you want to use moving forward (group 1) a member of the "legacy" group (group 2) so that all members of group 1 are members of group 2. You would then remove the users from group 2 and just add new users to group 1.