Not the same thing
Teleport has a range of 10 feet, and a target of:
You and up to eight willing creatures that you can see within range, or a single object that you can see within range. So in terms of the spell, those targets absolutely must be within 10 feet, AND must not be behind total cover. Otherwise you can't target them. Now the spell description can do to those targets whatever it wants, no issue there.
For plane shift, there is no "Target" field specified, and so the rules of targets does not apply.
For Scry, it has both a range of self AND a target....that is the problem. By the book, you cannot target anyone else, because they are outside the range of self. That is very very clearly not the RAI, but that is the RAW.
How Scry should be written is this:
Range: Unlimited, on the same plan.
Effect: (some clause in the spell) You can choose a creature or location even if they have total cover from you.
That would be teh technical way to keep the spell as is and make it RAW legal.
For reference, this is the rule for range and targets that I am using for this discussion:
Range
The target of a spell must be within the spell’s range. For a spell like
magic missile, the target is a creature. For a spell like
fireball, the target is the point in space where the ball of fire erupts.
Most spells have ranges expressed in feet. Some spells can target only a creature (including you) that you touch. Other spells, such as the
shield spell, affect only you. These spells have a range of self.
Spells that create cones or lines of effect that originate from you also have a range of self, indicating that the origin point of the spell’s effect must be you (see “
Areas of Effect”).
Once a spell is cast, its effects aren’t limited by its range, unless the spell’s description says otherwise.