Compare storage or string to another storage or string

I really like the storage system for Minecraft. However, there are things that I want to be able to do that I have no way of doing. Like comparing data.

I want the ability to execute a command if one data matches an input value or data from another storage. I can create some sample storage components.

data modify storage example a set value "a"
data modify storage example b set value "b"

And this could be the structure of the command:
execute if storage *storage* *nbt* *assignment (=, >=, matches, <=) *storage* *nbt*

Here are some examples of what the command could look like:
execute if storage example a = example b run say hi
execute if storage example a matches "a" run say hi

This would be a really helpful feature if it was put into Minecraft. A practical example would be to create a user database.

This would be a really helpful tool for many people. And I would use it in many projects if it got added. Thanks!