create action to place embed photo

It is hard to deal with sizes and file names in actions.  Adobe Photoshop  Action feature only has a conditions step that can inserted into actions that can a small number of document and layer conditions. There  are pain  to deal with for multiple actions in the same action set need be recorded before you record an action you insert a conditional step into to play other actions.  You can not pass files list to action or deal with image sizes because action are recorded photoshop steps that have recorded settings.  You can not use logic to change step settings or process passed file list.   You can make some action steps interactive where you can change  the recorded setting using when the action is played.  However, if you  make many steps in an action interactive only you will be able to use the action because you know how it works still it will not be easy to use  you not really automated a process you have created an interactive process which is hard to use. 

The Processing you want to do  requires the use of some logic you should look into Scripting Photoshop.

You may be able to create template and populate them automatically or interactively using scripts in my  Free Photoshop Photo Collage and Mockup Toolkit  Multiple Mockup Templates can be populate is a single Batch mockup run.  Only one collage template at a time can be populate with my Batch collage populating scripts.

Photoshop Place is strange. Scripting Place and dealing with Smat Object layers is complex.

i open a photo A and place embed a photo 1...
i open a photo B and place embed a photo 1... etc...

This is possible with Batch command and Action, as "photo 1" never changes, this is what would be recorded into the Action. The Batch command would open "photo A" and "photo B" etc., so these would not be recorded into the Action. Some layer re-ordering may be required and possibly other steps, it is hard to comment without any visuals or samples.

i open a photo A and place embed a photo 1...
i open a photo B and place embed a photo 2...

This is very different, I believe you would need a script, not a Batch Action – as you wish to "pair" two different files and repeat.