I agree with [USER=126614]@polarwoc[/USER] on both accounts, you have a limited option and you should use smart objects.
This can easily be done using smart objects.
My suggestion is to do what [USER=15323]@hawkeye[/USER] stated here.......
Stop here.
And then use "synched" SO layers in the following manner....
Convert the two layers created above into a "smart object". Name this layer "Original".
Copy the original SO layer and move into position.
Repeat this process until you have replaced all of the symbols. (you can Alt/Opt + drag and drop......each one will create it's own layer)
Place all of duplicated SO layers into a group.
In the future you can easily change all of the symbols by editing the original SO layer (Or any of the copies for that matter!) which will open as a PSB file.
You can even add a new symbol to the SO layer (PSB file) to replace them all with!
Unfortunately, you may have to chalk this one up to a learning experience.
It actually goes extremely fast!!!
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